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ImapSync
Imapsync is an IMAP transfers tool. The purpose of imapsync is to migrate IMAP accounts or to backup IMAP accounts. IMAP is one of the three current standard protocols to access mailboxes, the two others are POP3 and HTTP with webmails, webmails are often tied to an IMAP server. Upstream website is
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According to https://github.com/imapsync/imapsync/blob/master/FAQ.d/FAQ.Gmail.txt it's 500MB up/2500MB down. When I was migrating I was doing <1 message/sec.
Or maybe Got Your Back (GYB) which seems to register as an API app and might get you by the blacklist. See instructions.
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