Re: Is it safe to mix dovecot import/backup/sync between dovecot versions 2.2.30.2 and 2.3.7.1?

On 22 Dec 2019, at 12.22, Gerben Wierda gerben.wierda@rna.nl wrote:

I am migrating a server. The old one uses dovecot 2.2.30.2 and the new one 2.3.7.1. I don’t want to use any tool that might influence flags on messages. I am using Maildir format on both ends and I have a way to let one server access the data on the other (either using an rsync or a direct access).

Could I set up a sync between both to create a smooth migration?

rsync probably works out fine, but I would use native dovecot dsync myself.

Something like this run on the new server:

/usr/bin/doveadm backup -u <userid> -R ssh adminuser@old-server "sudo /usr/bin/doveadm dsync-server -u <olduserid>"

Sami