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<div class="moz-cite-prefix">On 11/03/2013 06:03 PM,
<a class="moz-txt-link-abbreviated" href="mailto:wcstaff@webcoast.com">wcstaff@webcoast.com</a> wrote:<br>
</div>
<blockquote cite="mid:058701ced8f1$56e66220$04b32660$@webcoast.com"
type="cite">
<pre wrap="">I know this is an arguable scenario, but I am sick of the spam getting
through that is <may be forged>.
It seems like spammers are figuring ways to forge and get around blocks.
I have recently found IP addresses that I force blocked, skating through on
a <may be forged>.
I read where some settings can be added to fail2ban that will reject these
emails. I tried adding them and it did not help.
I was also reading that Sendmail 8.4 has the feature
"FEATURE(`require_rdns')dnl", than can be enable or disabled.
My question is how do I turn on and off this feature? I looked in
sendmail.mc and "FEATURE(`require_rdns')dnl" does not exist.
Thanks
Tom
</pre>
</blockquote>
<small>We have used that feature in sendmail.mc.<br>
there are a number of FEATURE() items around line 70.<br>
We added after the last item, ran make and service sendmail
restart.<br>
75 FEATURE(use_ct_file)dnl<br>
76 FEATURE(require_rdns)dnl<br>
Some email servers are poorly maintained and do not have a PTR
record<br>
and they will be blocked, and their/your users may be unhappy.<br>
<br>
Gerald<br>
</small><br>
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