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Re: Configure sendmail to reject mail for unknown users?

On Monday, Mar 13th 2006 at 14:56 -0800, quoth Timothy Alberts:

=>I should ask a sendmail list, but this is the most responsive,
=>knowledgable group I've ever dealt with so...
=>How can I configure sendmail to reject mail for users that don't exist?
=>One of the annoying things that happens to my FC4 mail server all the
=>time is spammers/viruses will use fake accounts such as
=>'fakeadmin mydomain com' and my server always takes it because the
=>domain is correct.  It just gets delivered to the
=>postmaster mydomain com , I'd rather it not get into my server at all.
=>I think there are milters for sendmail to check against LDAP, but I
=>don't know the details of it yet, and I don't have an LDAP setup for the
=>my domain yet (still learning).  I was wondering if there is a way just
=>to configure sendmail to reject mail if it has a To: CC: or BCC: of a
=>user that doesn't really exist for a domain.

You have to go out of your way to accept mail for no-existant addresses. 
Here's what I used to do:

define(`LUSER_RELAY', `local:postmaster')

inside my sendmail.mc

If you comment that out then mail going to non-existant users will be 

Time flies like the wind. Fruit flies like a banana. Stranger things have  .0.
happened but none stranger than this. Does your driver's license say Organ ..0
Donor?Black holes are where God divided by zero. Listen to me! We are all- 000
individuals! What if this weren't a hypothetical question?
steveo at syslang.net

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