Rejecting Mail at RCPT

[Raymond Dijkxhoorn]

Hi!

> 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.

Bye,
Raymond