Reduce Email Bounces Before Launching a Campaign

Why it matters: Trim accidental spaces, reject malformed addresses and review obvious domain typos. Check whether the domain has a plausible mail route, but remember that domain-level checks do not establish mailbox existence. Do not silently correct an address to a different destination; a guessed correction can send personal content to the wrong person.

• Normalize formatting without inventing recipients.
• Flag suspicious corrections for review.
• Keep domain checks distinct from mailbox verification.

Why it matters: Catch-all domains, temporary server failures and anti-abuse defenses can produce uncertain verification results. Treat uncertain as a separate category rather than forcing valid or invalid. Prioritize current, corroborated addresses and review stale sources. Even a recent successful check can become outdated before a campaign sends.

• Keep unknown outcomes visible.
• Use source age as a review signal.
• Do not bypass rejection by cycling sender identities.

Why it matters: Apply known hard-bounce suppressions before every attempt, including retries and follow-ups. Monitor early campaign results and pause if the list behaves badly. Suppression is a safety control, not merely a reporting label. Cleaning the same source before future imports prevents invalid addresses from re-entering a campaign under a new list name.

• Use one authoritative suppression record.
• Recheck eligibility at send time.
• Investigate source-level failure patterns.