[Dshield] smtp test for open relay

Mark Tombaugh mtombaugh at alliedcc.com
Mon Jun 23 11:41:45 GMT 2003


On Monday 23 June 2003 12:27 am, Mark Tombaugh wrote:
> On Sunday 22 June 2003 8:31 pm, Marc Chabot (.net) wrote:
> > Hi.
> >
> > Do you have links to ips web sites (or others) that test for open
> > relays for an IP ?  I've got one to test and I don't know where to go.
>
> If this is a new mail server you might shoot yourself in the foot by using
> RBLs to test it. Test it yourself eg:
>
> telnet iptotest 25
> HELO
> MAIL FROM: blah at blah.com
> RCPT TO: your at email.com
> If you get this, the relay is open
> <return>.<return>
> quit
 
woops.. try:

telnet iptotest 25
 HELO
 MAIL FROM: blah at blah.com
 RCPT TO: your at email.com
 DATA
 If you get this, the relay is open
 <return>.<return>
 quit





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