smtp server test?

Scott Silva ssilva at SGVWATER.COM
Tue Mar 15 19:22:30 GMT 2005

    [ The following text is in the "ISO-8859-1" character set. ]
    [ Your display is set for the "US-ASCII" character set.  ]
    [ Some characters may be displayed incorrectly. ]

Joe Smith wrote:
> Any sendmail experts know of a milter that will check an inbound
> connection for a listening mail server?    Gotta be 90+ percent of
> spammers and virus connections don't have a listening smtp server.
I'm not sure if RFC's require a sending SMTP to also be a receiver.
Some large senders probably have separate sending and receiving mailers,
and you would get some false positives.
You could test for reverse-resolution, but there are a few legit.
mailers that have that broken also.

"If you have ever eaten crow,
It don't taste like chicken!!"

------------------------ MailScanner list ------------------------
To unsubscribe, email jiscmail at with the words:
'leave mailscanner' in the body of the email.
Before posting, read the MAQ ( and
the archives (

Support MailScanner development - buy the book off the website!

More information about the MailScanner mailing list