220 mta03-svc.ntlworld.com ESMTP server (InterMail vM.4.01.03.27 201-229-121-127
-20010626) ready Wed, 21 Aug 2002 11:25:16 +0100
250 mta03-svc.ntlworld.com
214-This SMTP server is a part of the InterMail E-mail system. For
214-information about InterMail, please see http://www.software.com
Then do help for a list of commands:
Quote:
214-
214- Supported commands:
214-
214- EHLO HELO MAIL RCPT DATA
214- VRFY RSET NOOP QUIT
214-
214- SMTP Extensions supported through EHLO:
214-
214- EXPN HELP SIZE
214-
214-For more information about a listed topic, use "HELP <topic>"
214 Please report mail-related problems to Postmaster at this site.
As you can see there is a Verify command, but upon running it, its disabled on this server, probably to stop people running their big spam lists against the server to see which are valid.
Joined: 23 May 2002 Posts: 3 Location: New Zealand
Posted: Thu Aug 22, 2002 2:02 am Post subject:
One thing to watch out for with this method is depending on the way some admins have setup their mail server it will look like it any address at the local domain will be valid. e.g.
Quote:
MAIL FROM: <asdfghjklwertwergg@localdomain.com>
250 Sender <asdfghjklwertwergg@localdomain.com> Ok
It is most likely that sdfghjklwertwergg is not a valid address, but it could appear to be depending on how the server is setup.
In saying that, this is still the best way to check. (to my knowledge).
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