Sendmail SPAM filtering - Red Hat
 

Is it possible to edit the sendmail.mc file and inclue a line something like:

FEATURE(`dnsbl', Mail to: address@mydomain.com, etc...

to make it seem that mail sent to that address would be identified as spam to the outside world?

If so, can someone please help with the syntax?

The way you phrase it is a bit odd, looks like you are actively seeking to get a domain blacklisted? No you can't do something like that that way, because 0) blacklists use the *sender* domain to determine that, so in order to get that domain blacklisted you would have to force spam to be *sent* from that domain, picked up by active submitters to get it propagating through the various blacklists and 1) as far as I know Sendmail it just doesn't do things that way.

you can only do it on inbound emails. if you want to prevent outgoing emails to be tagged as spam, you might try finding anti-spam appliance and use it as gateway for your mail server.