[Ilja]

I think there's a huge bug with downloading/synchronisation in Mail.app with an IMAP server:

When it downloads a huge amount of emails at once (ie: when you configure an IMAP account for the first time) it sets the receive-date as the date that you downloaded it, NOT to the date that you actually received that message.

For example I recently synchronized a couple of hundred email messages since I moved them recently through my web-interface (Fastmail) to another folder and just now my mail.app synchronized it and now all these email messages are flagged as if received today, not to the actual date that they were received...

Any way to solve this?

[Art Vandelay]

In the View menu, turn off the Date Received column and turn on the Date Sent column.

[Ilja]

Yeah, tried that, but then you got problems with emails sent from a different timezone... It's somewhat of an solution, but still: It's a bug...

[Art Vandelay]

I just tested this and I didn't have a problem importing new mail. The received timestamps were for when it was received at my account, not when it was imported into Mail. Also, showing the sent timestamp is still accurate too. The timezone differences are handled correctly.