Re: Preventing RELAY for sendmail8.8.8

[hUnTeR <hunter userfriendly net>]

Matt Quelch wrote:
> 
> I am running sendmail8.8.8 and need to prevent relaying.
> 
> I have read http://www.sendmail.org/antispam.html and modified my
> sendmail.cf file with the "Preventing Relaying Through Your SMTP Port"
> section of the doc.
> 
> I have created my sendmail.cR [with vi] static text file in /etc and
> addedd FQ names eg: mail.goodone.com
> 
> It does not detail what i need to do next to apply the changes ?

Matt - 

If at all possible, my FIRST suggestion would be to upgrade to 8.9.3 as
soon as you can. There are RPMs available for the upgrade at any one of
a handful of mirrors. The reason for the upgrade is that there are
several known exploits for sendmail as well as spam filtering
improvements within the newer versions. That having been said, sendmail
(at least i believe 8.8 is the same way), much like inetd services uses
a deny/allow system. Meaning, that you should have a relay-allow and an
ip-allow file somewhere on your system that you tell sendmail about
through the sendmail.cf file. These files tell sendmail who to trust to
do relaying. MOST sendmail systems, dont allow relaying by default, and
in order to allow certain customers to relay mail through your server
you need to tell it WHO it can trust (FQDN and IP). Check out the docs
on www.sendmail.org for more details.

But, by all means, if you CAN upgrade....DO SO!!!!

HTH
-- 
Michael B. Weiner
Systems Administrator/Partner
The UserFriendly Network (UFN)
--

             / /  (_)__  __ ____  __
            / /__/ / _ \/ // /\ \/ /  
           /____/_/_//_/\_,_/ /_/\_\ 

     * * * CHOICE OF A GNU GENERATION * * *