[qmailadmin] Server used to spam rcpthosts domains

[Sébastien Lefebvre]

Hi there,

I run a Qmail server with over 100 domains (Vpopmail,Qmailadmin, Qmail 
on Debian (Pape's packages)).

The tcprules file is ok so that the server is NOT openrelay.

But, this server is used to spam the few hundred users of the hundred 
domain (here is a test : I can telnet on port 25, give a mail from, rcpt 
to (to a domain in the rcpthosts file), and send mail to arbitrary 
chosen common names).

This loads the server a lot and send unwanted emails to the users.

What could I do to prevent this ?

Thanks a lot in advance,

Sébastien