 Server to Server - use imapsync for IMAP Migrations
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MAILS ON OLD IMAP SERVER
Do you have still IMAP access to the oldemail server?
If yes, then you couldperform a server to server migration.
Search on the forum, wiki and google for the unix script tool 'imapsync'.
Works fine for me to do IMAP migrations. But take cre about the exact options needed to conserver the 'received at' date.
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MAILS IN THUNDERBIRD ONLY
If you only have the emails in Thunderbird, try to reduce the number of connections. In Thunderbird Menu > Extras > Options > Advanced > about:config advanced settings
Search for the key's containing 'connect' or 'imap'. |