From Bugzilla Helper:
User-Agent: Mozilla/4.77 [en] (X11; U; Linux 2.4.7-ac1 i686)

Description of problem:
If you use linuxconf to configure sendmail you are given the
option (under "features") to enable the use of the Realtime
Blackhole list. Selecting this and generating a new sendmail.cf
does not result in a configuration that uses the blackhole list.

How reproducible:
Always

Steps to Reproduce:
1. enable realtime blackhole list.
2. regenerate sendmail.cf and quit linuxconf
3. send an email to nelson-rbl-test
	

Actual Results:  You get a message from linux.crynwr.com that you should
not
have gotten because it is on the RBL

Expected Results:  That message should have been dropped by sendmail.

Additional info:

Why does linuxconf not use the /etc/mail/sendmail.mc file to
generate the /etc/sendmail.cf. Everybody, including the sendmail
developers, suggest you do so. If you don't there is a high
probability that your rules are wrong.
And viola! they are wrong the RBL feature isn't working.