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Detect out-of-office replies, DSNs, MDNs, and list mail from structured headers, then prevent automatic email loops with a tested Node.js classifier.
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Build a runnable Node.js signup route that detects disposable email addresses, handles every status, and keeps unknown results out of hard blocks.
Read article →Secure bounce, complaint, and delivery webhooks by verifying raw-body signatures, rejecting replayed requests, and processing retries idempotently.
Read article →Set up BIMI with DMARC enforcement, a compliant SVG, mark evidence, and the right DNS record, then verify every layer without assuming logo display.
Read article →MTA-STS lets a receiving domain tell supporting senders which MX hosts are authorized and that delivery must use authenticated TLS. TLS-RPT tells the ...
Read article →Understand SMTP 550 5.1.1 at the RCPT TO stage, distinguish a missing mailbox from policy failures, decide when to retry, and map the evidence to sign...
Read article →Use email subdomains when transactional and marketing mail need separate sender identities, authentication settings, reporting, or operational ownersh...
Read article →A DKIM body hash did not verify error means the receiver hashed the canonicalized message body and got a value that does not match bh= in the DKIM-Sig...
Read article →If a domain publishes more than one TXT record beginning with v=spf1 , SPF evaluation returns permerror . Receivers do not combine the policies, choos...
Read article →Connect an MCP-compatible AI client to emailverifier.dev, authorize a project, call verify_email or check_domain, and keep uncertain results visible t...
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