Stop delivery to individual hosts in domain

[PilotMike]

Hello all.

I'd like to stop incomign email that contains a specific hostname, and I've not yet come across the way to do it in sendmail.

For example, if my domain is xyz.com, I want to reject any mail that has a hostname in it:

GOOD: postmaster@xyz.com

BAD: someone@

http://www.xyz.com,

anybody@gw.xyz.com, fred@temper.xyz.com

In other words, just email to %@xyz.com would be accepted.

Which directives and/or settings in the /etc/mail files would I need to make?

Thanks!

 

[stfaprc]

How would you tell if it was a host name? There are legitimate email addresses with more than 2 sections ,
for instance "ci.us.gov

 

[PilotMike]

This is true, however there has to be a way to identify which hostnames are *valid* versus *invalid* as far as mail delivery goes.

Here's what I found..

I configured sendmail to relay mail for *individual hosts* only (thanks to Sendmail Cookbook, recipe 3.7).

I did this by configuring the relay_hosts_only feature, FEATURE(`relay_hosts_only'), then creating a relay_domains file with just the domain names I wished to accept mail for. They are in this instance interpreted as *hostnames*...

relay_domains file contents:
domain.org
domain.biz

Now, email sent to "user@

http://www.domain.org"

or "user@ftp.domain.biz", for example, are reject since relaying isn't specified for those "hostnames". Mail to just "user@domain.org" or "user@domain.biz" is accepted.

This solved the problem and it works great now.

Thanks for contributing the question, stfaprc.