Jeff Peng via Postfix-users:
> On 2024-06-14 22:31, Wietse Venema via Postfix-users wrote:
> > Jeff Peng via Postfix-users:
> >> Hello,
> >>
> >> Is there any guide to setup a distributed email system? there should
> >> be
> >> multiple MX, multiple IMAP/storage servers, and sasl server cluster
> >> etc.
> >
> > That could be a job interview question.
> >
> > The easier part is setting up a pool of dataless Postfix SMTP
> > servers; sharding the users across a pool of replicated Dovecot
> > POP/IMAP servers; and nginx proxies.
>
> Are IMAP and smtp stateful protocols? If so I have to use hashes based
> on src IP etc.
There is a difference between IMAP/POP and SMTP. With IMAP/POP a
front end proxy needs to connect each user to the right message
store instance. With SMTP, different sessions can be handled by
different servers. The servers can figure where to deliver mail.
Wietse
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