grep filters to block open relay

[Ugo Bellavance]

Stephen Swaney wrote:
<snip>

> 
> "Sorry, I'm so brain dead that I'll accept email for any address at this
> domain but the user you tried to send email to, Viagra at mysillydomain.com,
> doesn't have an account on this server so I'm sending you this useless
> message that will sit in my outbound queue for 5 days wasting my resources,
> because the address I'm trying to send to is bogus and won't accept the
> message" 

LOL!