Am 22.03.2018 um 12:42 schrieb Robert Schetterer: > 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 > > https://blog.sys4.de/xymon-dovecot-count-imap-pop3-logins-graph-central-rsyslog-server-ubuntu-lucid-en.html > > > >
beside iptables recent, or fail2ban which may have unwanted side effects and only work by ip here was a post with a dovecot solution https://www.dovecot.org/list/dovecot/2017-July/108521.html never tested this Best Regards MfG Robert Schetterer -- [*] sys4 AG http://sys4.de, +49 (89) 30 90 46 64 Schleißheimer Straße 26/MG, 80333 München Sitz der Gesellschaft: München, Amtsgericht München: HRB 199263 Vorstand: Patrick Ben Koetter, Marc Schiffbauer Aufsichtsratsvorsitzender: Florian Kirstein
