lists-centos wrote:

You have to have changed more than just the sendmail.mc/cf to make a default centos sendmail setup an open mail relay.

Your /etc/mail/access file is where things are defined as to what you relay for. The /etc/mail/local-host-names effects what you accept mail for.

Make certain that what you're using to test that's it's an open relay is reporting things correctly. There's a difference between sendmail being "open" (accepting mail from the outside) and an "open relay". The former is expected from a mail server, the latter is a problem.

I use:

http://verify.abuse.net/cgi-bin/relaytest

which runs through a range of tests. I tried it against your 24.123.23.170 mail server a few min. ago and all was fine.

• Rick

------------ Original Message ------------

...

Date: Wednesday, November 12, 2008 03:33:11 PM -0500 From: Jerry Geis geisj@pagestation.com To: CentOS ML centos@centos.org Subject: [CentOS] close open relay

hi all, running centos 4.7 i686.

I seem to have an o pen r elay sendmail server. How do I close it?

I have the STRAIGHT centos install sendmail.mc file. Only thing I changed was: dnl DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl

so as to allow incoming email and not just localhost. however this seems to relay everyone.

I looked at http://www.sendmail.org/tips/relaying but it just talks about (AFIKT) enabling specific relays to occur - not how to CLOSE the relaying.

How do I close the relay?

Jerry _______________________________________________ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos

------------ End Original Message ------------

When I run the following I get broken web page:

http://verify.abuse.net/cgi-bin/relaytest

I am getting investigating all this as I am getting return emails from sbcglobal that I am spam.

Jerry