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

FM Kappungal

February 25, 2019 06:11

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.

Denis Gomes Franco

February 25, 2019 14:43

Thanks, I'll check it out!

cPanelMichael

February 25, 2019 18:54

Hello @Denis Gomes Franco, You may also find the user-submitted workaround on the following thread helpful: Thank you.

February 25, 2019 20:28

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.

March 04, 2019 10:30

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).

Migrating a large amount of emails

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