Dovecot behind Load Balancer

[Paolo Daniele]

Il 10/07/19 10:27, Aki Tuomi ha scritto:
>> 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
Actually:

mail_max_userip_connections = 500

Thanks,
Paolo

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