On 22/09/2019 4:08 AM, @lbutlr via dovecot wrote: >> So while I was migrating the mail, I did try for a while to understand the >> format of the UID files, but failed to do so in the available time, so the >> client just had to deal with duplicate emails. But now the smoke has >> cleared, I'd like to understand the problem a little better, and I was >> hoping someone on this forum could explain it to me, and the changes I'd >> need to make to the files so that the POP client DIDN'T download the >> duplicate emails. > > Did you check <https://wiki.dovecot.org/Migration>? It has a lot of info on > this.
I did see that page, but was unable to figure out which of the three UID related files I needed to keep, and which to edit in order to 'trick' the email client into not re-downloading the mails. The migration was from dovecot 2.x to 2.x, so I don't think there was any translation issue between servers. The POP clients were Outlook (my old nemesis). The only information I could find is that the dovecot UIDL format is pop3_uidl_format = %v.%u But that didn't really take me anywhere. So its all a bit of a mystery. I was hoping there would be a UID guru on this list who could walk me through it, or point me to some reference. > Don’t know, but dsync says it does this: > "The pop3-migration plugin is used to preserve POP3 UIDLs. When dsync is > handling IMAP INBOX and requests a POP3 UIDL, the plugin connects to the POP3 > server and figures out which IMAP messages match which POP3 messages and then > returns the appropriate POP3 UIDL.” > Trouble is, if you are migrating POP and the server is not up, I am not sure > what you can do with dsync? I did try to use dsync (aka doveadm sync) for a few hours, but couldn't get a test account to migrate across. It seems like this would have been the solution but I was unable to confirm. At times it seemed to login and complete without error, but I could never find where it had put the mail! Other times it refused to login or gave permission errors. I looked around for real life examples, but wasn't able to find any. Had I got it to work, I could maybe have figured out the UID problem. Maybe that will be a project for me in the future, when I have a spare few hours! Maybe if I gave a few details of the directory structure that would help. I was migrating from a Cpanel installation to a standalone mail server. In Cpanel, there was the admin account login, and under that ~/mail/domain1.com/mailbox1 ~/mail/domain1.com/mailbox2 ~/mail/domain2.com/mailbox1 ~/mail/domain2.com/mailbox2 On the target server the same structure existed. One login, admin, and under that account ~/mail/domain1.com/mailbox1 ~/mail/domain1.com/mailbox2 ~/mail/domain2.com/mailbox1 ~/mail/domain2.com/mailbox2 All files and directories were chown admin:mail The command I used was doveadm sync -u t...@domain.com ssh -i id_rsa -o "StrictHostKeyChecking=no" admin@100.110.120.130 I tried a few options to tell it where to put the mail, but dovecot on the target server didn't seem to know where each account was located. P.
