Dovecot behind Load Balancer

[Aki Tuomi]

> On 10/07/2019 11:24 Paolo Daniele via dovecot <dovecot at dovecot.org> wrote:
> 
>  
> Il 10/07/19 10:20, Aki Tuomi ha scritto:
> >> On 12/06/2019 20:02 Paolo Daniele via dovecot <dovecot at dovecot.org> wrote:
> >>
> >>
> >>   Hi,
> >>   i've a question for you.
> >>   I've two dovecot imap/pop server behind a zen load balancer.
> >>   Load balancing is made by lx4nat so the public ip address of my load balancer contact directly the dovecot servers.
> >>   Since few months i've a message from thunderbird that i've reached the imap limit login for ip.
> >>   I've triend to increase the max user ip parameter but sometimes i've the same problem.
> >>   It's a strange things that actually i'm able to mitigate by reduce the number of cached connections in Thunderbird but it's not normal.
> >>   What do you think about that?
> >>   Maybe there's some tuning that you can suggest.
> >>   Thank you,
> >>   Paolo
> >>
> > Have you ensured, by checking logs, that the connections are seen by dovecot to come from public IP addresses?
> >
> > Also, thunderbird is known to open lots of concurrent connections.
> >
> > Aki
> Yes,
> connections are coming from the ip address of load balancer (also 
> checked with a netstat -an)
> I know that thunderbird has this problem and i haven't problem since the 
> numbers of email domain increase.
> I'm not sure the impact of rising the max user ip to an higher value in 
> terms of ram consumption and cpu
> Any suggestion?
> Thanks for your answer!
> Paolo
> 

What's your current limit? The default value is 100.

Aki