Downloading mailbox from replica server

Claudio Corvino ccorvino at
Wed Dec 1 12:03:51 UTC 2021

Hi Christian,

this is just what I wanted to do from the beginning, but reading here I 
thought it was not possible:

"Replication works only between server pairs. If you have a large 
cluster, you need multiple independently functioning Dovecot backend 
pairs. _*This means that director isn't currently supported with 
replication*_. The replication in general is a bit resource intensive, 
so it's not recommended to be used in multi-million user installations. "


I'll try then!



On 01/12/21 10:08, Christian Mack wrote:
> Hello
> Thunderbird/Outlook does that, because you change the servername in your
> configuration.
> In order to avoid that, use a reverse proxy and switch on it between
> your IMAP servers.
> You can use a dovecot director for that.
> In your clients you only configure the proxy.
> That also avoids changing configuration on all of your clients.
> Kind regards,
> Christian Mack
> Am 01.12.21 um 09:31 schrieb Claudio Corvino:
>> Hi,
>> I have two IMAP/LMTP Dovecot server in replica (version both
>> connected through an IPsec tunnel, I use LDAP/AD for /userdb, /all seems
>> to be working.
>> I have a question: if I switch my Thunderbird/Outlook client to use the
>> other server I have to download again all the emails, about 10 GB.
>> Is there any way to avoid this? Do I have to download again all the
>> folders every time I switch from node A to node B on my client?
>> Thanks!
>> Regards
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