[CentOS] close open relay

Jerry Geis geisj at pagestation.com
Wed Nov 12 21:44:02 UTC 2008


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 at pagestation.com>
>> To: CentOS ML <centos at 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 at 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





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