I've migrated a cPanel virtual server across to my Webmin server.

It appears to have gone well, aside from one email account, which now cannot show its 'sent' folder in Outlook or Thunderbird. The same problem occurs in webmail.

Thunderbird and webmail both advise looking at the error logs for the time and date of notification.

My server is running Postfix and Dovecot.

My questions are:

1. Which log will likely contain information about the error and where can I find it?
2. Is there a way I can verify that a mail account's folders or check that they aren't 'corrupted' in any way?

Electronic mail requires two servers:

1. IMAP, or POP, handles inbound traffic only.
2. SMTP handles outbound traffic only.

Therefore, the "sent-mail box" functionality that we have all become used to, actually requires the cooperation of two different servers. You can have the functionality that you seek if, and only if:

• A single company (or, your company) runs both of these.
• The SMTP requires authentication for outbound mail (so the sender thereof can be conclusively known).
• They are both configured to populate such a mailbox (and "trash," etc...) on the server side.

For whatever reason, the sent items folder on the email account is now working and accessible.

I'd still be interested in knowing which error log the error would have been reported in and what its location is likely to be, though.