Re: Postfix is not open relay but send spam

[Allen Coates]

On 15/10/2019 08:27, Julien Michaux wrote:
> Time to time, my server is attack and he sends spam. All spam are from a
> specific address "cy...@mydomain.com" I tried many things but nothing works> 
> I have to stop postfix for some hours and attack ends until next time.
> 

Have you tried putting "cy...@mydomain.com reject" into your sender_access file?

It is a crude quick-fix, and would also put a marker in your log-file.

hope this helps

allen C