Re: [exim] How to limit the number of emails sent by each us…

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Author: Lena
Date:  
To: Sebastian Nielsen
CC: exim-users
Subject: Re: [exim] How to limit the number of emails sent by each user
> From: Sebastian Nielsen

> I would suggest using an config that restricts authenticated users to
> a specific IP range. Then no bots from china can successfully guess a
> account.


I restrict authenticated users to a non-standard port (neither 25, 465 nor 587):

daemon_smtp_ports = 25 : 1234

 accept authenticated = *
        condition = ${if !={$received_port}{25}}
        control = submission/domain=


If bots aren't blocked, they waste connection time and RAM, in effect like DoS.
This https://github.com/Exim/exim/wiki/BlockCracking blocks bots from both
wasting resources and spamming.

> That will prevent accounts from being hacked and used in spamming


Passwords mostly are stolen with Windows malware or phishing.