|Don't ask to ask, just ask|
Re: Determine if domain is actually used for emailby blue_cowdawg (Prior)
|on Oct 04, 2011 at 15:33 UTC||Need Help??|
You're on the right track.
In order for a domain to be valid for email you are required to have an MX record for it. The majority of MTAs will fail to send to your domain if you do not have an MX record. The other thing you can do is connect to port 25 for that domain name and check to see if an MTA answers.
There's a sample session for you to see.
As far as Perl modules go to help with this check out Net::DNS and especially look at the mx method for the default resolver. Then there is cpan:://Net::Telnet module which you can customize to connect to port 25.
Hope this helps...
Peter L. Berghold -- Unix Professional
Peter -at- Berghold -dot- Net; AOL IM redcowdawg Yahoo IM: blue_cowdawg