Rejecting Mail at RCPT

Spicer, Kevin Kevin.Spicer at BMRB.CO.UK
Thu Dec 18 08:50:04 GMT 2003

Raymond Dijkxhoorn wrote:
> 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.
Does anyone whether its possible to check against Active Directory (it is LDAP after all)?  I tried once and failed - and never had the time to pursue it.  If so, is there a howto anywhere?

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