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Can I easily and quickly import a large number of messages (say, 75k) from one IMAP-enabled email provider to Gmail?

Currently, all my archived messages live on, but I really miss some aspects of Google’s UX, including search. I’m on a Mac, but every time I try manually migrating (via Mail or Thunderbird) by copying the messages, I get timed-out or an error prevents them from properly migrating.

This isn’t just from to Gmail—I’ve encountered similar challenges when attempting to move a large number of messages to any IMAP provider. Does the IMAP protocol say anything specific about large numbers of messages within a given mailbox?

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Setup two IMAP account and drag and drop the files to the other account – Ramhound Mar 4 '14 at 3:05

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