limit pop login per user and per minute

Robert Schetterer rs at
Thu Mar 22 13:42:00 EET 2018

Am 22.03.2018 um 11:21 schrieb Markus Eckerl:
> Hi,
> like I have written in the subject line I want to limit the pop login
> per user and per minute.
> Currently I am having several customers which are fetching their email
> with popcon (MS Exchange).
> This has never been a problem. But... They all have got the same
> "technician" which take care of their systems.
> The problem is, that he misconfigured the servers of these customers. In
> detail: their servers are trying to fetch email every 2 - 5 seconds. For
> every email address.
> In the past I contacted the technician and told him about his mistake.
> He was not very helpful and simply told me that he is doing the same
> configuration since several years at all of his customer servers.
> Without problems. It is up to me to fix my problem myself.
> Well, I googled a lot but all I found is to limit for a specific IP or
> for a secific account. Both is not what I am looking for.
> Maybe someone can give me a hint?
> Thanks and kind regards
> Markus

I had about 5000 popcon users in the past , dovecot can handle this
if you turn right parameters on. As far i remember there were also 2 
different ways to configure popcon, users per time or all users in one 
session ( which was really bullshit ) , after all i wouldnt recommand
trying limiting ,that might lead to further problems. Your customer has 
to understand his misconfiguration

some graph of that time is here

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