A suppression list records addresses that a sending tool excludes from some or all future mailings. The scope depends on the tool and its settings. An unsubscribe or permanent delivery failure can be a reason for suppression.
How does a suppression list differ from a blocklist?
A suppression list applies when the sender selects recipients. Receiving mail servers can use an email blocklist to assess messages based on the sending IP address or domain. The lists operate at different points in the sending process.
Example after a reimport
An unsubscribed address appears again in a later export file. Check that the import preserves existing suppression records and that the address is still excluded from the planned mailing. In mailfino, a suppressed address is excluded from newsletter sends.
