Direct answer
First verify that the original permission is still appropriate, retain unsubscribe records and consider reconfirming interest. Then verify the addresses before a new campaign.
More questions and answers
How do I clean a list after a company merger?
Align consent and suppression histories, standardise fields and deduplicate contacts. Verify active addresses only after applying the combined opt-outs and hard-bounce records.
What do I do with an email list from an old CRM?
Export email, record ID, last activity and subscription status. Remove or suppress known opt-outs and bounces, deduplicate and verify the remaining contact addresses.
Should I delete old contacts who never opened emails?
Lack of an open is not definitive proof of inactivity because open tracking is imperfect. Use multiple engagement signals and your retention policy, with address verification as one separate input.
How do I remove former employees from business contact lists?
An individual may have changed jobs even if the domain works. Verification can flag dead mailboxes but cannot reliably prove current employment. Confirm important contacts through current sources.
Can I reuse last year's verified email list?
Verification becomes stale because addresses and mail servers change. Recheck before significant campaigns, especially when the list has not been used recently.
What should I do with a spreadsheet of 20-year-old emails?
Start by checking provenance and permission rather than sending to the whole list. Old addresses are particularly likely to be obsolete; verify only contacts you still have a valid reason to contact.
Can I merge an old suppression file with a new email list?
Yes. Normalise emails, join the suppression file by address or stable contact ID and exclude those records from the sendable list before verification or sending.