Rejecting Mail at RCPT

Raymond Dijkxhoorn raymond at PROLOCATION.NET
Thu Dec 18 00:46:30 GMT 2003


> Does anybody know of a way to get Sendmail to check with a remote SMTP
> server to see if a user is valid at the RCPT TO:?
> At my site, a good portion of the spam we get is to invalid users. If i can
> get Sendmail to check with the Remote SMTP server
> before it queues it, that would reduce the amount of spam on my site by at
> least 30%!

Put your users in LDAP and check with LDAP on your frontend servers.


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