Any way to limit number of active IMAP/POP3 sessions from a single user / per user?

[Timo Sirainen]

On 3 Jul 2017, at 9.24, Aki Tuomi <aki.tuomi at dovecot.fi> wrote:
> 
> 
> 
> On 02.07.2017 10:53, Alexey Asemov (Alex/AT) wrote:
>> Hello,
>> 
>> Just wonder: is there any way in Dovecot to limit number of active
>> IMAP/POP3 connections for a single user, not touching any other users?
>> Basically, the situation is single user hammering servers by lots of
>> POP3 connections from time to time, and limiting exactly one user
>> could be good.
> 
> Easiest would be to use 2.2.29 or later and use policy server for it.
> With older version, I'm not sure if this is doable sensibly.

I think returning mail_max_userip_connections from userdb works.