Date: Thu, 3 Apr 1997 09:29:10 -0800 (PST) From: Dan Busarow <dan@dpcsys.com> To: Steve <shovey@buffnet.net> Cc: questions@freebsd.org Subject: Re: Uninvited usage for sendmail Message-ID: <Pine.UW2.3.95.970403092006.20819D-100000@cedb> In-Reply-To: <Pine.BSI.3.95.970403093338.13766D-100000@buffnet11.buffnet.net>
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On Thu, 3 Apr 1997, Steve wrote: > On Wed, 2 Apr 1997, Dan Busarow wrote: > > Get sendmail 8.8.5 (seems stable now, been out for a couple of months) > > and install the check_* rules. check_relay is the one you want. > > One note on this sort of thing. I have had to deal with sites who didnt > do this well - where due to mx records, my mailer would try to send to > userid@machine1.someplace.com via mail.someplace.com and > mail.someplace.com would complain I was trying to relay - Quite true. When I first installed these I carefully listed all the sites we MX for and built an mxhosts file to be used in conjunction with check_relay. I then spent the next couple of days watching syslog for "no relay" messages sent in error and found several sites I had forgotten about cause they run their own nameservers. Once the initial setup is done it's pretty easy to maintain though, and it really pays off. It's no fun being postmaster at a site some sleaze bag uses as a SPAM relay and our rule sets have caught several attempts since we installed them. Dan -- Dan Busarow 714 443 4172 DPC Systems / Beach.Net dan@dpcsys.com Dana Point, California 83 09 EF 59 E0 11 89 B4 8D 09 DB FD E1 DD 0C 82
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