Re: [OT] Sendmail: Open relay was tested as closed but...

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Am 21.04.2014 20:02, schrieb Dan Thurman:

I found an old posting you made here:
http://compgroups.net/comp.mail.sendmail/problem-using-port-587/1312021

The internet does not forget ;)

Knute Johnson wrote:
[...]
:: I want to be able to have the outside world connect to my sendmail on
:: port 25 and port 587.  Is that possible?  What do I need to change?

Alexander Dalloz replied:
: Do you have more than the 1 IP (208.1.40.42)? If not it is sufficient to
: configure in sendmail.mc:
:
: DAEMON_OPTIONS(`Port=smtp, Name=MTA')dnl
: DAEMON_OPTIONS(`Port=submission, Name=MSA, M=Ea')dnl
[...]

So, I tried only the two DAEMONs and 'telnet localhost 587' worked!

Well, 2 comments about that.

If no IP address is specified using DAEMON_OPTIONS, then Sendmail binds the specific daemon to all available interfaces/addresses. That can be desired or not. In case you restrict that to say 1 of your multiple public IP addresses, then localhost too will not have a daemon bound. That can make your mail flow fail.

Second, the DAEMON_OPTIONS definitions for the different ports (smtp and submission) are supplemental. Defining DAEMON_OPTIONS for the MTA on port 25 does no influence the MSA on port 587 and vice versa.

So far,  I see no spamming as of yet...

That's good. It would even be better to know what action has made it stopping. Do you still see spammers trying to misused your Sendmail as a relay? That would be something to be expected once the system got identified as a misusable relay.

Alexander



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