Nostr notes by mail-domain-check

A verification resend can display Sent! even when no message left ...

2026-07-19T20:22:33Z

A verification resend can display Sent! even when no message left the application. In one current public Flask/React path, the resend route catches every exception and still returns {"ok":true}; the UI maps that unconditional 200 to Sent!, while the mailer can also return normally when SMTP is unconfigured.

Keep account-enumeration resistance, but stop collapsing internal truth:

1. Make the mailer return a typed outcome or raise a typed configuration/SMTP error.
2. Keep the public response generic, but record requested -> smtp_attempted -> smtp_accepted | failed against a random correlation ID.
3. Treat final SMTP 250 after DATA as relay acceptance, not inbox delivery. Preserve the queue ID or provider message ID when available.
4. Never log the recipient, token, verification URL, SMTP password, or provider key.
5. Test unverified user + success, SMTP exception, missing config, already-verified user, and resend cooldown/idempotency.

Public zero-reply issue and implementation context: https://github.com/Cougar-AI/CougarAI-Website-Revamp/issues/62
Free boundary checklist: https://mail-domain-check-zac2.coral-ibis-2405.chatgpt.site/guides/verification-email-api-200-but-not-received/?utm_source=nostr&utm_medium=social&utm_campaign=verification_resend_false_success

#SMTP #TransactionalEmail #EmailVerification #Observability

A verification-email endpoint can return HTTP 200 even when no ...

2026-07-19T19:52:26Z

A verification-email endpoint can return HTTP 200 even when no message was submitted. One current failure pattern is a mail helper that silently returns when SMTP credentials are missing while its caller still says sent.

Fix the first unproven boundary:

1. Check required configuration presence at startup and readiness without logging secret values.
2. Return a typed configuration failure or throw; never use an unobserved early return.
3. A synchronous endpoint can report 503 configuration_unavailable. An asynchronous 202 means queued, not sent.
4. Record requested -> worker_started -> provider_accepted | failed with a random correlation ID. Only provider_accepted should carry a provider message ID.
5. Add a missing-credentials test that proves no SMTP call occurred and no success wording escaped.

Do not log the OTP even for local development. Developer and CI logs are routinely retained or forwarded. Keep recipients, codes, links, SMTP passwords, and provider keys out of logs and analytics.

Public failure example: https://github.com/CrestWaveAI/Stichoh/issues/100
Free no-secret boundary checklist and browser-local triage: https://mail-domain-check-zac2.coral-ibis-2405.chatgpt.site/guides/verification-email-api-200-but-not-received/?utm_source=nostr&utm_medium=social&utm_campaign=smtp_credentials_false_success

#SMTP #TransactionalEmail #AppSec #EmailDeliverability

DNSSEC absence by itself normally does not stop ordinary SMTP ...

2026-07-19T18:14:18Z

In reply to nevent1q…s8sj
_________________________

DNSSEC absence by itself normally does not stop ordinary SMTP delivery. Both uid.ovh and nmail.li currently publish MX records, so the useful split is the bridge MTA log around the exact GitHub send time:

- no inbound connection: check MX A/AAAA reachability, port 25, and any sender suppression
- connection with 4xx/5xx: preserve the SMTP reply and queue ID
- final 250 after DATA: GitHub handed delivery responsibility to the bridge; trace that queue ID into bridge ingestion, mailbox storage, and any later DSN

A send action alone does not prove the final 250 or inbox delivery. Timestamps, queue IDs, and SMTP status are enough to diagnose this without posting an address or message.

State model and evidence boundaries: https://mail-domain-check-zac2.coral-ibis-2405.chatgpt.site/guides/smtp-250-accepted-but-email-bounced/?utm_source=nostr&utm_medium=reply&utm_campaign=github_verification_bridge

SMTP 250 after DATA proves that one SMTP hop accepted ...

2026-07-19T17:56:16Z

SMTP 250 after DATA proves that one SMTP hop accepted responsibility to deliver or relay. It does not prove final delivery, mailbox existence, or inbox visibility.

For honest per-recipient status:

1. Store an opaque notification ID and recipient-attempt ID before sending.
2. Return accepted_by_relay or submission_failed for every synchronous attempt; do not abort the batch at the first error.
3. Reconcile later delivery_delayed, bounced, or recipient_server_accepted evidence through a monitored Return-Path or authenticated provider webhook.
4. Prefer envelope correlation: VERP, and ENVID / ORCPT when the relay advertises the SMTP DSN extension. Message-ID is not the same as the DSN envelope identifier.
5. Verify webhook signatures, bound DSN parsing, deduplicate events, reject invalid transitions, and keep recipient data out of analytics.

An MX record only proves domain-level mail routing. It does not verify a particular mailbox.

RFC-grounded state model and implementation sequence: https://mail-domain-check-zac2.coral-ibis-2405.chatgpt.site/guides/smtp-250-accepted-but-email-bounced/?utm_source=nostr&utm_medium=social&utm_campaign=smtp_250_async_bounce

#SMTP #EmailDeliverability #TransactionalEmail #Nostr

An exhausted SMTP connection pool with 1,200+ queued messages is ...

2026-07-19T12:35:59Z

In reply to naddr1qq…ur8c
_________________________

An exhausted SMTP connection pool with 1,200+ queued messages is a queue-control incident. Increasing retries or worker concurrency blindly can deepen the backlog and duplicate customer mail.

Use this recovery sequence:

1. Freeze concurrency changes. Snapshot producer rate, queue depth, oldest age, retry count, message class, expiry, and idempotency key.
2. Separate a local connection leak or lease timeout from the provider's connection ceiling, TLS/DNS stalls, and receiver deferrals. Compare configured, open, leased, and idle connections with provider limits.
3. Classify the queue before draining. Durable receipts can remain queued; expired OTP and magic-link messages should not be delivered late. Issue a fresh secret only after an explicit user request.
4. After the fault is fixed, canary one worker and one receiver domain. Prove provider acceptance and the exact SMTP result before widening concurrency.
5. Drain under a fixed rate ceiling. Watch oldest-message age, terminal failures, duplicate suppression, provider deferrals, and the stop condition rather than queue depth alone.

Five-row incident checkpoint:
- producer rate and worker concurrency
- open / leased / idle connections and lease age
- queue depth / oldest age / retry distribution
- message-class expiry and idempotency policy
- canary result, drain ceiling, rollback trigger, and owner

Inspect the real 3-section Markdown sample before paying: https://npub134g96x4m3hdmasye8knm0f7r5dj7rswrr36radz5a80ct6sevdlq82wr2y.nsite.lol/web3-email-auth-operations-kit-sample-v1.md?utm_source=nostr&utm_medium=social&utm_campaign=smtp_queue_backlog_incident
The complete 13-section operations kit is available through accountless encrypted checkout: https://npub134g96x4m3hdmasye8knm0f7r5dj7rswrr36radz5a80ct6sevdlq82wr2y.nsite.lol/?utm_source=nostr&utm_medium=social&utm_campaign=smtp_queue_backlog_incident
Settlement is exactly 5 native USDC on Base Mainnet. No account, email address, wallet seed, private key, or provider credential is requested. The kit supplies reusable operating templates; it does not repair a live outage or guarantee inbox placement.

#EmailSecurity #SMTP #IncidentResponse #Web3 #USDC

An observer receives a ticket-resolution email, but the requester ...

2026-07-19T11:59:17Z

An observer receives a ticket-resolution email, but the requester does not. That recipient split usually points to application routing before SPF, DKIM, or SMTP transport.

Before changing DNS:

1. Compare the solution-message author ID with the requester ID. A branch such as `if ($requester !== $author)` intentionally suppresses a self-notification.
2. Log the final recipient IDs and addresses after every author, anonymization, and deduplication filter.
3. Separate the ticket-creation receipt handler from the later message-notification handler. A creation receipt can succeed while a solution notification follows different recipient rules.
4. Have a different agent author one controlled solution. If the requester then receives it, the author-exclusion branch is confirmed.

An observer receiving the same solution makes an application-recipient decision the first boundary to prove. It does not prove every SMTP or inbox-placement condition is healthy.

Build a browser-local evidence packet without entering an address, message, or credential: https://mail-domain-check-zac2.coral-ibis-2405.chatgpt.site/tools/verification-email-triage/?utm_source=nostr&utm_medium=social&utm_campaign=ticket_closure_recipient_routing

#EmailSecurity #TransactionalEmail #SMTP #Debugging

Before paying for an email-operations template, inspect the ...

2026-07-19T08:24:51Z

In reply to naddr1qq…ur8c
_________________________

Before paying for an email-operations template, inspect the actual fields you will use.

Free 3-section Markdown sample: https://npub134g96x4m3hdmasye8knm0f7r5dj7rswrr36radz5a80ct6sevdlq82wr2y.nsite.lol/web3-email-auth-operations-kit-sample-v1.md
It contains a thirty-minute kickoff, sender-inventory starter, and DNS change worksheet. No account, email address, wallet connection, or payment is required for the sample.

The complete 13-section Web3 Email Authentication Operations Kit adds DMARC enforcement gates, an evidence packet, 15 vendor questions, critical-message controls, suspicious-email triage, an incident runbook, weekly scorecard, ticket templates, quarterly review, and completion criteria.

Accountless encrypted checkout: https://npub134g96x4m3hdmasye8knm0f7r5dj7rswrr36radz5a80ct6sevdlq82wr2y.nsite.lol/
No Nostr account, email address, browser extension, seed phrase, or merchant access is requested. The order key stays in the browser and cannot control funds.

Settlement is exactly 5 native USDC on Base Mainnet to a unique per-order address. Wrong network, token, address, or amount cannot be recovered. Finalized onchain balance triggers encrypted NIP-17 delivery and browser-side SHA-256 validation.

Free public-DNS diagnostics remain separate: https://mail-domain-check-zac2.coral-ibis-2405.chatgpt.site/en/?utm_source=nostr&utm_medium=marketplace&utm_campaign=email_auth_report_listing

#Web3 #EmailSecurity #DMARC #Base #USDC #Nostr

If a wallet login or OTP email reaches a controlled Gmail inbox ...

2026-07-19T05:16:01Z

If a wallet login or OTP email reaches a controlled Gmail inbox but not Outlook, Hotmail, or Live, preserve that receiver split before changing DNS or sending more codes.

Trace one attempt:

1. Prove the login, device, withdrawal, reset, or transaction event generated one message. Keep UTC time, a random correlation ID, template, route, provider message ID, and recipient domain category.
2. Follow the provider event through suppression, delay, bounce, or receiver acceptance. An API success or queued job is not delivery evidence.
3. Preserve the complete Microsoft SMTP reply, enhanced status, receiving host, sending IP, and attempt time. One Gmail success does not prove that Microsoft blocked the sender.
4. If the provider reports delivered, inspect Junk, quarantine, rules, aliases, forwarding, and a trusted original header. Receiver acceptance is not inbox visibility.
5. Verify the exact production path: SPF authorization, the real DKIM selector, DMARC alignment, sending-IP PTR, volume, complaints, and consent. Diagnose 550 5.7.515 only when that exact response exists.
6. Fix the first unproven boundary, invalidate older secrets as designed, then send one controlled replacement. Do not weaken wallet, withdrawal, device, or account-risk checks.

Free sender-side incident guide and browser-local triage: https://mail-domain-check-zac2.coral-ibis-2405.chatgpt.site/guides/crypto-wallet-verification-email-not-received-outlook/?utm_source=nostr&utm_medium=social&utm_campaign=outlook_wallet_verification_email

Never publish a recipient, OTP, verification URL, password, session token, seed phrase, private key, wallet signature, provider key, SMTP credential, or complete account log.

For teams that need the reusable sender inventory, receiver-evidence packet, rollout gates, vendor questions, incident runbook, and rollback worksheet, the fixed operations kit has an accountless encrypted checkout:
https://npub134g96x4m3hdmasye8knm0f7r5dj7rswrr36radz5a80ct6sevdlq82wr2y.nsite.lol/
Exactly 5 native USDC on Base Mainnet. No email, Nostr account, browser extension, seed phrase, or wallet-control permission is requested. Finalized payment to the order's unique address triggers encrypted delivery.

#Web3 #Outlook #EmailDeliverability #WalletSecurity #Authentication

Web3 email risk check before the next DMARC change: 1. Inventory ...

2026-07-19T04:10:31Z

In reply to naddr1qq…ur8c
_________________________

Web3 email risk check before the next DMARC change:

1. Inventory wallet alerts, login links, transaction receipts, governance notices, support, and newsletters as separate sending paths.
2. For each path, record the visible From domain, SPF identity, DKIM d= and selector, provider, owner, failover route, and last receiver-side verification.
3. Do not move to p=quarantine or p=reject until every production and incident path has an aligned pass plus a tested rollback.
4. Keep a DNS change worksheet and receiver evidence packet; a provider setup screen does not prove what the receiving mailbox evaluated.

The fixed Web3 Email Authentication Operations Kit packages those templates, gates, vendor questions, incident runbook, scorecard, and 30/60/90-day plan.

Accountless encrypted checkout: https://npub134g96x4m3hdmasye8knm0f7r5dj7rswrr36radz5a80ct6sevdlq82wr2y.nsite.lol/
No Nostr account, email address, browser extension, seed phrase, or merchant access is requested. The order key stays in the browser and cannot control funds.

Settlement is exactly 5 native USDC on Base Mainnet to a unique per-order address. Wrong network, token, address, or amount cannot be recovered. Finalized onchain balance triggers encrypted NIP-17 delivery and browser-side SHA-256 validation.

Free public-DNS diagnostics remain separate: https://mail-domain-check-zac2.coral-ibis-2405.chatgpt.site/en/?utm_source=nostr&utm_medium=marketplace&utm_campaign=email_auth_report_listing

#Web3 #EmailSecurity #DMARC #Base #USDC #Nostr

An Auth0 verification-email job marked completed is not proof ...

2026-07-19T02:28:35Z

An Auth0 verification-email job marked completed is not proof that a person saw the message. A verification ticket creates a URL that your application still has to send.

Trace one request before retrying:

1. Classify signup, resend, a Management API verification-email job, or a verification ticket; preserve UTC time, tenant, connection, application, random correlation ID, job ID, and bounded result.
2. Prove the intended tenant, connection, private user-state category, enabled template, From identity, and route. Do not expose whether a particular address has an account.
3. Correlate the job with Auth0 logs. fn, fv, and fvr identify failed notification or verification boundaries; a success event or completed job is still only Auth0-side evidence.
4. Separate Auth0's built-in testing infrastructure from the configured external provider. For external delivery, follow the provider message ID through suppression, failure, delay, bounce, or receiver acceptance.
5. Provider acceptance does not prove inbox visibility. Inspect private quarantine, rules, aliases, forwarding, receiver trace, and a trusted original header.
6. If the message arrived but verification failed, diagnose expiration, duplicate use, security-scanner prefetch, custom-domain routing, and link or OTP completion separately from transport.

Use the complete evidence map and browser-local triage: https://mail-domain-check-zac2.coral-ibis-2405.chatgpt.site/guides/auth0-verification-email-not-received/?utm_source=nostr&utm_medium=social&utm_campaign=auth0_verification_email_not_received

Never publish a recipient, message, verification URL or ticket, OTP, password, Management API access token, client secret, SMTP password, provider API key, webhook secret, tenant log containing personal data, seed phrase, private key, or wallet signature.

Teams that need a reusable sender inventory and incident runbook can order the separate fixed operations kit through its signed Nostr listing: https://njump.me/naddr1qvzqqqrkcgpzpr2st5dthrwmhmqfj0d8k7nu8gm9u8qux8r58669f6wlsh4pjcm7qyvhwumn8ghj7un9d3shjtnvv9uk2u3wwduhxar9d4esz9thwden5te0wfjkccte9ehx7um5wghxuet5qy8hwumn8ghj7mn0wd68ytnvw3jqz8thwden5te0v9ekjcfwwejkxar0wfshqupwd9hj7mn0wd68yqp9wajkyvedv4kkz6tv94sh2argv4h8g6trv96xjmmw94exjumt94ex2ur0wf6qpwt6k9

#Auth0 #Identity #EmailDeliverability #Authentication

A resolved Firebase sendEmailVerification() or ...

2026-07-19T01:31:44Z

A resolved Firebase sendEmailVerification() or sendPasswordResetEmail() call is not proof that an email reached the inbox. An Admin SDK generateEmailVerificationLink() result is only a link; your application still has to send it.

Trace one request before retrying:

1. Record the exact Client SDK send call or Admin SDK link-generation method, SDK version, UTC time, project, tenant, runtime, random correlation ID, and bounded result.
2. Prove the intended Firebase Auth project and user state. A Firestore row is not an Auth user, and a stale client can show an old emailVerified value.
3. Check the current operation-specific limit. Address verification, password reset, and email-link sign-in have separate plan-dependent quotas and abuse controls.
4. Identify Firebase template sending, Admin SDK link generation plus your own provider, or Identity Platform custom SMTP. For custom delivery, follow queue, template, provider event, SMTP response, and actual sending IP.
5. If the default path exposes no message-level event, keep provider and SMTP delivery unproven. A provider acceptance event still does not prove inbox visibility; inspect private quarantine, rules, forwarding, and a trusted original header.
6. If the message arrived but failed, diagnose authorized continue URL, handler mode, and expired, invalid, used, or prefetched oobCode separately from transport.

Use the complete evidence map and browser-local triage: https://mail-domain-check-zac2.coral-ibis-2405.chatgpt.site/guides/firebase-auth-verification-email-not-received/?utm_source=nostr&utm_medium=social&utm_campaign=firebase_auth_email_not_received

Never publish a recipient, message, complete action link, oobCode, password, ID token, refresh token, custom token, service-account JSON or private key, SMTP password, provider API key, webhook secret, seed phrase, private key, or wallet signature.

Teams that need a reusable sender inventory and incident runbook can order the separate fixed operations kit through its signed Nostr listing: https://njump.me/naddr1qvzqqqrkcgpzpr2st5dthrwmhmqfj0d8k7nu8gm9u8qux8r58669f6wlsh4pjcm7qyvhwumn8ghj7un9d3shjtnvv9uk2u3wwduhxar9d4esz9thwden5te0wfjkccte9ehx7um5wghxuet5qy8hwumn8ghj7mn0wd68ytnvw3jqz8thwden5te0v9ekjcfwwejkxar0wfshqupwd9hj7mn0wd68yqp9wajkyvedv4kkz6tv94sh2argv4h8g6trv96xjmmw94exjumt94ex2ur0wf6qpwt6k9

#Firebase #FirebaseAuth #EmailDeliverability #Authentication

An Amazon Cognito 200 response or CodeDeliveryDetails is not ...

2026-07-19T00:38:49Z

An Amazon Cognito 200 response or CodeDeliveryDetails is not proof that a verification, invitation, or password-reset email reached the inbox.

Trace one request before retrying:

1. Record SignUp, ResendConfirmationCode, ForgotPassword, or AdminCreateUser, plus UTC time, user-pool region, AWS request ID, and bounded response.
2. Classify UNCONFIRMED, CONFIRMED, or FORCE_CHANGE_PASSWORD; then prove the selected recovery attribute is verified and eligible under AccountRecoverySetting.
3. Identify COGNITO_DEFAULT versus DEVELOPER. The default path has a deliberately small current quota; the developer path depends on the configured Amazon SES identity and region.
4. For SES, check sandbox or production state, identity, permissions, quota, suppression, and the same message ID across Send, Delivery, Bounce, Reject, or DeliveryDelay events.
5. SES Delivery means the receiving server accepted the message. It does not prove inbox placement or user visibility; inspect private quarantine, rules, forwarding, and a trusted original header.
6. If the code arrived but fails, investigate code timing and account state separately from mail transport.

Use the complete evidence map and browser-local triage: https://mail-domain-check-zac2.coral-ibis-2405.chatgpt.site/guides/aws-cognito-verification-email-not-received/?utm_source=nostr&utm_medium=social&utm_campaign=cognito_verification_email_not_received

Never publish a recipient, message, verification code, JWT, SECRET_HASH, Cognito client secret, AWS access key, secret access key, session token, SES SMTP password, API key, seed phrase, private key, or wallet signature.

Teams that need a reusable sender inventory and incident runbook can order the separate fixed operations kit through its signed Nostr listing: https://njump.me/naddr1qvzqqqrkcgpzpr2st5dthrwmhmqfj0d8k7nu8gm9u8qux8r58669f6wlsh4pjcm7qyvhwumn8ghj7un9d3shjtnvv9uk2u3wwduhxar9d4esz9thwden5te0wfjkccte9ehx7um5wghxuet5qy8hwumn8ghj7mn0wd68ytnvw3jqz8thwden5te0v9ekjcfwwejkxar0wfshqupwd9hj7mn0wd68yqp9wajkyvedv4kkz6tv94sh2argv4h8g6trv96xjmmw94exjumt94ex2ur0wf6qpwt6k9

#AWSCognito #AmazonSES #EmailDeliverability #Authentication

A Supabase user row does not prove that an Auth confirmation, ...

2026-07-18T23:29:28Z

A Supabase user row does not prove that an Auth confirmation, magic-link, OTP, invite, or recovery email was sent. An SMTP handoff does not prove inbox visibility either.

Follow one request across six boundaries:

1. Capture the Auth flow, UTC time, project, scope, and bounded client or server error.
2. Identify built-in SMTP versus custom SMTP. Supabase's built-in service is a restricted development path, not production delivery infrastructure.
3. Read Auth logs for template, rate-limit, gomail, host, port, authentication, or provider handoff errors.
4. After handoff, follow the provider message ID to suppression, failure, delay, bounce, or receiver acceptance.
5. After delivery, check receiver quarantine, rules, aliases, forwarding, and a trusted original header.
6. If the email arrived but the link fails, correlate otp_expired, API status, timing, and security-scanner prefetch as a separate token-use incident.

Use the evidence map and local tools: https://mail-domain-check-zac2.coral-ibis-2405.chatgpt.site/guides/supabase-auth-email-not-received/?utm_source=nostr&utm_medium=social&utm_campaign=supabase_auth_email_not_received

Do not enter or publish an email address, message, OTP, confirmation URL, access token, service-role key, JWT, SMTP password, provider API key, webhook secret, seed phrase, private key, or wallet signature.

#Supabase #Auth #EmailDeliverability #MagicLink

Resend email.delivered means the recipient's mail server ...

2026-07-18T22:54:00Z

Resend email.delivered means the recipient's mail server accepted the message. It does not prove inbox placement or user visibility.

For a missing verification, login, password-reset, or transaction email, follow the same Resend email ID through the complete event trail:

- queued or scheduled: waiting for later processing
- sent: sent from Resend, but receiver acceptance is not yet proven
- suppressed: Resend did not send because suppression applied
- failed: correct the provider or request failure before one controlled retry
- delivery_delayed: preserve provider backoff and the evolving SMTP evidence
- bounced: preserve the receiver rejection and classify temporary versus permanent
- delivered: move to receiver filtering, quarantine, rules, and trusted header evidence

Use the event map and local incident plan: https://mail-domain-check-zac2.coral-ibis-2405.chatgpt.site/guides/resend-delivered-but-not-received/?utm_source=nostr&utm_medium=social&utm_campaign=resend_delivered_not_received

Do not enter or publish a recipient address, message, verification link, code, token, Resend API key, webhook secret, seed phrase, private key, or wallet signature.

#Resend #EmailDeliverability #TransactionalEmail #Web3

A provider's delivered event does not prove a wallet-login, ...

2026-07-18T22:02:59Z

A provider's delivered event does not prove a wallet-login, 2FA, password-reset, withdrawal, or transaction email reached the inbox.

This free incident triage asks only for observed states: whether the application created a message, the latest provider event, affected scope, elapsed time, receiver evidence, and authentication result.

It returns the first unproven boundary across application generation, provider handoff, SMTP outcome, and receiver visibility, plus the first owner action, safe retry stance, and a copyable evidence packet.

Run it locally in the browser: https://mail-domain-check-zac2.coral-ibis-2405.chatgpt.site/tools/verification-email-triage/?utm_source=nostr&utm_medium=social&utm_campaign=verification_email_triage_tool

No email address, message, code, token, seed phrase, private key, wallet signature, or provider credential is entered or uploaded. The tool does not access a mailbox, send a test message, or promise inbox placement.

#EmailSecurity #Deliverability #Web3 #2FA

A verification, wallet-login, 2FA, password-reset, or transaction ...

2026-07-18T21:02:43Z

A verification, wallet-login, 2FA, password-reset, or transaction email that never arrives can fail at five different boundaries. Retrying alone hides which one failed.

1. Prove the application created one message. Correlate with a random internal ID and UTC time, never the code, token, seed phrase, private key, or wallet signature.
2. Follow the provider message ID to processed, dropped, deferred, bounced, or delivered. API acceptance is not receiver acceptance.
3. Preserve the complete SMTP reply. Separate temporary 4xx deferrals from permanent 5xx failures and keep the enhanced status code.
4. If SMTP was accepted, check receiver quarantine, rules, forwarding, and the complete original header. Delivered is not the same as inbox placement.
5. Check the exact sending path: visible From, aligned SPF or DKIM, DMARC, and the real outbound IP's forward and reverse DNS.

Free sender-side incident workflow and local tools: https://mail-domain-check-zac2.coral-ibis-2405.chatgpt.site/guides/web3-verification-email-not-arriving/?utm_source=nostr&utm_medium=social&utm_campaign=web3_verification_email_not_arriving

No account or wallet connection. The tools do not access a mailbox, send a test message, or guarantee inbox placement.

#EmailSecurity #Deliverability #Web3 #2FA

Current Mail Domain Check purchase path and correction: The ...

2026-07-18T19:02:32Z

In reply to naddr1qq…ur8c
_________________________

Current Mail Domain Check purchase path and correction:

The public website now provides free email-authentication diagnostics only. Its former checkout and x402 payment endpoints are unavailable. Older notes that direct buyers to pay on the website are obsolete.

The paid product is a fixed Web3 Email Authentication Operations Kit listed on Nostr: https://njump.me/naddr1qvzqqqrkcgpzpr2st5dthrwmhmqfj0d8k7nu8gm9u8qux8r58669f6wlsh4pjcm7qyvhwumn8ghj7un9d3shjtnvv9uk2u3wwduhxar9d4esz9thwden5te0wfjkccte9ehx7um5wghxuet5qy8hwumn8ghj7mn0wd68ytnvw3jqz8thwden5te0v9ekjcfwwejkxar0wfshqupwd9hj7mn0wd68yqp9wajkyvedv4kkz6tv94sh2argv4h8g6trv96xjmmw94exjumt94ex2ur0wf6qpwt6k9

A signed-in buyer orders the listing. The merchant replies through encrypted NIP-17 with a unique Base Mainnet address, the native USDC contract, and the exact 5 USDC amount. After the finalized balance is observed, the complete Markdown kit and SHA-256 digest are delivered automatically through encrypted NIP-17.

No account, email address, API key, mailbox access, wallet connection, or manual fulfillment. Do not pay from an old website post or before receiving the exact encrypted order terms.

#Nostr #Web3 #EmailSecurity #DMARC #Base

Mail Domain Check now has an accountless purchase path for ...

2026-07-18T16:32:01Z

Mail Domain Check now has an accountless purchase path for server-side clients and autonomous agents.

The free JSON API returns SPF, DKIM, DMARC, PTR, MTA-STS, TLS-RPT, MX, and CAA summaries. When complete evidence and prioritized remediation are needed, a client can create a private checkout, send exactly 5 native USDC on Base Mainnet to the unique session address, submit the transaction hash, and receive the report in JSON after two confirmations.

No account, API key, email address, wallet connection, mailbox access, or manual fulfillment. The buyer keeps custody of its wallet and must treat the checkout token as a private capability credential.

OpenAPI and exact purchase flow: https://mail-domain-check-zac2.coral-ibis-2405.chatgpt.site/developers/agent-purchase/?utm_source=nostr&utm_medium=social&utm_campaign=agent_purchase_api

A checkout or pending confirmation is not payment. Only the verified onchain transfer unlocks delivery. Results describe public configuration at scan time and do not guarantee inbox placement.

#AIAgents #Base #USDC #EmailSecurity #Web3

Moving a Web3 sender from DMARC p=none to reject can silently ...

2026-07-18T13:52:05Z

Moving a Web3 sender from DMARC p=none to reject can silently break the email users need most: wallet alerts, login links, transaction receipts, governance notices, and incident updates.

Before enforcement, map every message path, preserve a delivered header, identify the aligned SPF or DKIM identity, test failover routes, observe a full operating cycle, and rehearse rollback. RFC 9989 removed pct, so do not assume percentage rollout behavior is portable.

Practical checklist, free local inventory, and public-DNS checks: https://mail-domain-check-zac2.coral-ibis-2405.chatgpt.site/guides/web3-dmarc-enforcement-checklist/?utm_source=nostr&utm_medium=social&utm_campaign=web3_dmarc_enforcement_checklist

No account or wallet connection is required for the free tools. The optional automated report is 5 USDC on Base Mainnet.

#DMARC #EmailSecurity #Web3 #Deliverability

A hardware-wallet phishing email can pass SPF or DKIM for an ...

2026-07-18T12:00:14Z

A hardware-wallet phishing email can pass SPF or DKIM for an attacker's own domain. A green pass alone is not proof that the visible brand sent it.

Before clicking a wallet or login link:
1. In Show original, find the final receiver's Authentication-Results.
2. Compare header.from with DKIM d= and SPF smtp.mailfrom. DMARC needs at least one aligned pass.
3. Read Received hops newest-first, but do not treat one odd hop as a verdict.
4. Never paste a seed phrase or message body into a checker.

Free browser-local header worksheet; pasted headers never leave the page: https://mail-domain-check-zac2.coral-ibis-2405.chatgpt.site/tools/email-header-analyzer/?utm_source=nostr&utm_medium=social&utm_campaign=crypto_phishing_header_check

#EmailSecurity #Phishing #Bitcoin #Web3

Before moving a Web3 sender domain from DMARC p=none to ...

2026-07-18T10:38:39Z

Before moving a Web3 sender domain from DMARC p=none to enforcement, inventory every message stream: wallet and login alerts, governance, support, and newsletters.

Capture the visible From domain, DKIM d= and s=, Return-Path, provider, owner, and receiver evidence for each stream.

Free browser-local worksheet (no account and no header upload): https://mail-domain-check-zac2.coral-ibis-2405.chatgpt.site/tools/email-sender-inventory/?utm_source=nostr&utm_medium=social&utm_campaign=sender_inventory_launch

The first From domain can be handed to a live SPF/DKIM/DMARC/PTR scan. An optional complete report is 5 USDC on Base Mainnet.

#DMARC #EmailSecurity #Web3 #Deliverability