Email Hygiene Checklist Every Sender Should Run Before a Campaign

An email hygiene checklist gives a sending team a repeatable set of checks to run before any major campaign, reducing the chance that a preventable list quality problem turns into a bounce spike or a reputation hit. Most deliverability failures trace back to a small number of recurring issues, and a short checklist run consistently catches them before they cause damage.

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The first item on any email hygiene checklist is verifying the list itself. Every address should be checked for correct formatting, a valid domain with active mail records, and a real, reachable mailbox, along with screening for disposable addresses and spam trap patterns. This single step catches the majority of what would otherwise become bounces.

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The second item is confirming how recently the list was last verified. A list cleaned six months ago has already accumulated new decay, since email addresses fail at a steady rate as people change jobs and abandon old inboxes. A general rule of sixty to ninety days between verification passes keeps decay from reaching levels that affect deliverability.

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The third item is checking authentication. SPF, DKIM, and DMARC should all be correctly configured and passing before any bulk send, since missing or broken authentication is one of the fastest paths to spam folder placement regardless of how clean the list is.

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The fourth item is reviewing catch-all addresses specifically if the list includes B2B contacts. Standard checks often label these unknown, which is not useful information. A confidence-scored result tells you which catch-all addresses are safe to mail and which to hold back.

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Prime Verifier covers the list verification step in a single pass, checking format, domain, mailbox, and risk factors while applying confidence scoring to catch-all addresses, all in minutes regardless of list size.

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ABOUT: Prime Verifier is an email verifier and email verification platform that helps senders run a thorough list check before every campaign, protecting deliverability at 99%+ accuracy. Learn more at https://primeverifier.com/