Migrating a large amount of emails
Hey everyone. Any tips on migrating a very large (~28 GB mailbox)?
Here's the thing: my personal email is currently hosted at Zoho. As I'm paying for their premium service, my account has IMAP and POP3 access. I use the Mailsync Cpanel plugin (great plugin by the way) whenever one of my customers want to migrate their mailboxes to my servers.
But the last time I ran Mailsync on a 4 GB mailbox, it took quite some hours for the process to finish. It ran flawlessly but I don't know how long it took as I let it run overnight. I figure that 28 gigabytes would take a day or even more, so I'm looking into speedier solutions.
Zoho lets me download a full ZIP archive of emails (split in parts in case of a large mailbox like mine) but they are in EML format, which as I understand is incompatible with Dovecot.
I think I can WGET these ZIP archives directly into the server so I can download these mails directly to the server without going through my PC first, but what about the file format? And what about messages' timestamps?
Or will I really need to use the plugin and pray for it to not be interrupted mid-operation? :D
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Have you tried imapsync by lamiral? Have found it to be pretty fast. Have used it on mailboxes of around 20GB that got over in few hours. 0 -
Thanks, I'll check it out! 0 -
Hello @Denis Gomes Franco, You may also find the user-submitted workaround on the following thread helpful: Thank you. 0 -
Hey! I just found out that the Mailsync plugin that I'm already using (- Removed -) ships with and uses IMAPSync... So I'll stay with MailSync, the interface is good enough and really it's very easy to bring emails from other servers. 0 -
Quick update for those who will read this thread: 1. I finished migrating my ~28 GB mailbox. 2. Process took about 6 hours. Guess we can say the speed was 4,6 GB per hour, or ~78 MB per minute 3. IMAPSYNC ran just fine on the first try (while migrating other customers sometimes I had to retry 2 or 3 times as it would hang mid-transfer). 4. IMAPSYNC took quite a long time to calculate folder sizes as there were quite a lot of messages there (around 60k). 0
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