Russell Nelson <[EMAIL PROTECTED]> writes:
> Michael Boyiazis writes:
>> I went through qmail-smtpd and added a bit of code to do a
>> gethostbyaddr. If I don't get a value, I refuse the mail due to no
>> reverse DNS. Now looking over some comments in this list and with a
>> little closer look at the setup routine in qmail-smtpd.c it appears if
>> the name cannot be resolved, remoteip and/or remotehost get set to
>> 'unknown'. Would it make sense to deny mail if either of these is
>> 'unknown'. and/or set tcpserver option -p?
> Yes and no. You get too many false positives. Then again, AOL seems
> to get away with it.
This practice is so widespread that I think it's reaching the point where
it's pointless. The spammers use valid addresses now because they know
people do this, and the legitimate folks have been forced to fix their
DNS. I still see some rejections from our mail servers that do this
(mostly spam), but it's slowing a lot.
--
Russ Allbery ([EMAIL PROTECTED]) <URL:http://www.eyrie.org/~eagle/>
