Practical procedures with primary sources, risk decisions and illustrative examples. Maintained by the team behind Easy Email Verification.
Understand syntax, MX and mailbox signals, then map valid, invalid and unknown results to explicit application decisions.
Triage SMTP failures by cause. Separate recipient rejection from temporary deferral and sender-policy problems.
Inspect real message headers, DNS and DMARC alignment. Build an authorized-sender inventory before changing enforcement.
Catch-all acceptance does not confirm an individual mailbox. Use a review policy for existing contacts and signup forms.
Back up consent and suppression history, verify an authorized export, map results carefully and audit the CRM update.
Locate failures before SMTP, during delivery or after acceptance. Match the fix to evidence from the actual sending stream.