IMAP Migration Tools

Christos Chatzaras chris at
Thu Nov 28 19:19:33 EET 2019

> On 28 Nov 2019, at 18:21, Dean via dovecot <dovecot at> wrote:
> On 2019-11-28 10:47 am, Julian Kippels via dovecot wrote:
>> Hi,
>> I am looking for tools to migrate Mails from one IMAP-Server to
>> another. Until now I have always used imapsync, but it seems very
>> slow. Even over a 2x10GB/s connection I only get speeds of about
>> 600KiB/s, because the programm always pauses betweeen every single
>> mail.
>> Does anyone here have a suggestion for an alternative?
> Take a look at mbsync (isync).  Very flexible and quite fast.  I've also used offlineimap for a long time.
> DC

Here is an .offlineimaprc example :

accounts = main

[Account main]
localrepository = dstAccount
remoterepository = sourceAccount

[Repository sourceAccount]
type = IMAP
remotehost =
remoteuser = old at
remotepass = oldpass
ssl = no
readonly = true

[Repository dstAccount]
type = IMAP
remotehost =
remoteuser = new at
remotepass = newpass
ssl = no

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