How to test sendmail security (no relaying)?

[Cowles, Steve]

Don wrote:
> I have sendmail running, and set it up so I can receive mail from
> anywhere. 
> 
> I've done some rudimentary testing to make sure relaying is not
> allowed, but I'm sure there's people out there more clever than I
> when it comes to hacking into/through systems.  
> 
> Just like the www.grc.com site that will do a port scan and report
> it's findings, it would be very cool if there was a tool to relay a
> message through a specified smtp server. (The message would be
> generated by the test tool so the tool itself could not be used to
> send spam)    
> 
> Anyway... does anybody have any suggestions for how to really test
> the security (specifically guarding against unauthorized relaying). 
> 
> Thanks,
> Don Russell
> (North America: Pacific Time Zone)
> 
>         \|/
>        (. .)
>  ___ooO-(_)-Ooo___


I have always used the following site to test my mail server

http://abuse.net/relay.html

Steve Cowles