Domains spoofs

[Alex Neuman van der Hans]

Doc Schneider wrote:
> Thanks Alex. I will block those "noreply@" and guess I'll need to make 
> sure to add noreply at freshmeat.net as being OK--since that is how they 
> send out their project updates and whatnot. But I'll also look for that
> "block bad helo hack" on sendmail.org and see if that is what I need 
> to use.
>
> Thanks again!
>
http://www.cs.niu.edu/~rickert/cf/bad-ehlo.html
http://www.cs.niu.edu/~rickert/cf/hack/block_bad_helo.m4

The html file explains that AUTH'd clients could be blocked if their 
"HELO" is malformed (aka some versions of LookOut! and LookOut! Express, 
and certain Windows configurations). You may want to look into 
"delay_checks" and other ways to make sure local clients will be able to 
send out e-mail.