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Thanks for the reply. I thought IMAP servers keep the messages on the server, not on the client. Is that incorrect?

• generalizations 5y ago
  IMAP synchronizes with the server, but keeps a local copy. Compare to POP, which moves the mail off the server entirely.
  • oarsinsync 5y ago
    > IMAP synchronizes with the server, but keeps a local copy. The local copy is client dependent. Mail.app on your iPhone will not keep a local copy of all your emails if you have a large number of emails spanning a long period of time. Other clients may vary.
• kureikain 5y ago
  The client has download a copy already and wont sync back what it is already download. You can look into tools like imapsync https://github.com/imapsync/imapsync https://github.com/imapsync/imapsync to copy data from two imap account