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Mailman

IMAP mailbox migration

Source server

Server hostname or email

Provider preset

Port

Username (full email) Password

Destination server

Server hostname or email

Provider preset

Port

Username (full email) Password

Folders & mapping

Skip duplicates (match by Message-ID) Auto-create folders for unmapped matches

Run migration

Mailman ignores TLS certificate name mismatches so mail.<domain> hosts work out of the box. Use app-specific passwords where required (Gmail, iCloud, Outlook).