Re: Mail without MUA?

[Miles Fidelman <mfidelman@meetinghouse.net>]

Erwan David wrote:
> Le 07/01/2014 20:55, Brian a écrit :
> > On Tue 07 Jan 2014 at 19:58:31 +0100, Hans wrote:
> >
> > > Hi Erwan,
> > > > As root do /usr/sbin/lsof -i:25
> > > > You'll see what smtp server is on.
> > > >
> > > > Note that a smtp server is needed by several basic Unix utilities (like
> > > > cron).
> > > Hmm, looks like postfix.
> > > lsof -i:25
> > > COMMAND   PID USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
> > > master  10288 root   12u  IPv4  15076      0t0  TCP *:smtp (LISTEN)
> > >
> > > So, postfix is listening? Maybe I misconfigured it.
> > How do you know it is postfix? There is nothing here which indictes it.
> > Is it because you know you have postfix installed so that is why you say
> > "looks like postfix".?
> >
> > A misconfiguration? Who knows? It probably doesn't matter for your
> > problem.
> >
> > There are only two ways to get email. Either it is delivered to you or
> > you go and collect it, often with POP3, What method do you use? Have it
> > delivered or go to collect?
> master is the name of the main postfix process. But note that having a
> MTA running won't get emails from the provider pop3 server...
Typically, you should also see a couple of smtpd processes as well as 
master.  Install the psmisc process and run pstree to get a handle on 
what's running, which processes own which other processes, and the order 
in which they all came up.

What's also missing here, is what DNS records are being advertised about 
your box.