Milter-greylist

On 2016-09-08 09:39, Marcus Schopen lists-yahoogroups@... 
[milter-greylist] wrote:
> Hi Maren,
> 
> On 2016-09-08 09:12, maren.zubizarreta@... [milter-greylist] wrote:
>> Hello:
>> 
>> We want to implement an ACL with a ratelimit per authenticated user,
>> this is to prevent SPAMMing when one of our user's credentials are
>> stolen, and a SPAMMER using different IPs and the same user
>> credentials tries to send SPAm throuh our system.
>> 
>> Is it possible to do it using milter-greylist? I haven't found how.
> 
> Would interest me too, good idea! Do you think changing IPs on a
> smtp-auth account is a good hint of abuse? What if all spam is sent
> from
> one IP, e.g. if a users notebook is infected by a virus and uses your
> smtp relay to send spam. May be a hard limit number for a user account
> 
> combined with changing IPs and/or geoip.

Some examples/ideas:

http://myspew.com/software/how-to-rate-limit-smtp-with-milter-greylist

and see for "Rate Limit" in greylist.conf. Not exact your case, but some 
ideas.

Ciao!