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Re: Setting up SMTP?

Am Mi, den 27.10.2004 schrieb James McKenzie um 4:05:

> >Simply place a "dnl " in front of the DAEMON_OPTIONS line. This is what
> >the comment above says.

> Does the dnl mean "Do Not Load"?  I thought you needed this line, but 
> you don't need the address (Addr) parameter.  When we set up both linux 
> and *NIX, we add this line to prevent being an open proxy.  I'm 
> definately learning here.
> James McKenzie

The dnl is a macro in the context of m4 and from "man m4":

       dnl    The  dnl macro shall cause m4 to discard all input
characters up
              to and including the next <newline>.

So it stands for: "do next line" and ignore the rest of this one.

The DAEMON_OPTIONS line is not needed. By default the created
sendmail.cf will have Sendmail bound the MTA to each available address.
So you only need a DAEMON_OPTIONS line if you want to change the
default, i.e. limiting the addresses or changing the port or setting a
specific modifier.


When setting up a new Sendmail host you always add a DAEMON_OPTIONS line
to the .mc file to prevent being an open proxy? That makes not much
sense. At least an instruction

DAEMON_OPTIONS(`Port=smtp, Name=MTA')dnl

causes nothing specific for the resulting sendmail.cf file. And I don't
really understand in which way you speak about "proxy". Do you instead
mean "open relay"?

Here a practical example where it makes sense to modify the daemon
settings using DAEMON_OPTIONS. On one of my Sendmail MX hosts I am

DAEMON_OPTIONS(`Addr=, Port=smtp, Name=MTA,
DAEMON_OPTIONS(`Addr=, Port=smtp, Name=MTA)dnl
DAEMON_OPTIONS(`Addr=, Port=submission, Name=MSA,

First line: I specify a specific IP (one of several on the host) the
Sendmail daemon shall be bound to, bound to port 25 (given by smtp),
specify for which daemon ( here the MTA) and which milters shall be used
for it.
Second line: As I limit the MTA to be bound on a specific IP I have to
explicitly add the loopback address too ( because else
Sendmail would not listen there and some elementary functionality would
Third line: I configure the MSA, which is the submission service, to be
bound to a specific IP and change the modifier, which is by default only
"M=E". I set it to be "M=Ea" and this way force authentication on port
587. To be able to change the MSA you have to deactivate the standard
MSA before:


This is a specific issue for the submission agent.


Alexander Dalloz | Enger, Germany | GPG key 1024D/ED695653 1999-07-13
Fedora GNU/Linux Core 2 (Tettnang) kernel 2.6.8-1.521smp 
Serendipity 04:56:54 up 7 days, 1:36, load average: 0.24, 0.36, 0.48 

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