Email list hygiene means regularly checking a mailing list for errors and outdated records. This includes clearly invalid addresses, duplicates, and permanent delivery failures. Unsubscribe and suppression records still need to be checked before sending.
What should you check before importing?
Map email addresses and other fields correctly. Check which addresses are already in the system and which sending records must survive the merge. A new entry in an import file alone tells you nothing about whether that person should receive the newsletter.
Example with two mailing lists
An address appears in both an event list and the general newsletter list. Before sending, the team checks that the message will go out only once and that the correct subscription status applies. mailfino’s list check shows invalid addresses and duplicates before applying changes.
