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

[Alexey Asemov (Alex/AT)]

Hello Aki, Timo,

Thanks a lot for your answers. I'll test with setting 
mail_max_userip_connections from DB first and tell if it works. If it 
does not, I'll go with the policy server.

Again, thanks a lot.

On 03.07.2017 9:29, Timo Sirainen wrote:
> 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.
>