j_70@xxxxxxxxxxx wrote:
I guess the curiosity here is that:
[root@rhel1 root]$ ps -aeef | grep mail
root 19005 18945 0 20:23 pts/0 00:00:00 grep mail
[root@rhel1 root]$
[root@rhel1 root]$ ps -aeef | grep master
root 19081 18945 0 20:24 pts/0 00:00:00 grep master
[root@rhel1 root]$
Yet root has 123 messages. Where are they being served-up from????
That depends on a number of things - firstly what mail server is running
(if any) and if no server is running, how the host has been setup to
submit mail. The old version of sendmail simply checked to see if mail
was local and wrote it directly to the local user mbox (/var/spool/mail)
- this all changed a wee while back (redhat 9 i believe, may have been
FC1|[AE]S3 tho) and used an SMTP submission system that would still
allow you to submit mail with /bin/mail even if you were running
something like postfix/qmail/etc that delivered to a different location
or format.
To find out, you need to first see if you are listening on port 25, to
do this try
netstat -an | grep LIST | grep :25
The output should look something like..
[root@wibble steve]# netstat -an | grep LIST | grep :25
tcp 0 0 0.0.0.0:25 0.0.0.0:*
LISTEN
where the first set of 0.0.0.0s is your local address, this may be an IP
(127.0.0.1 or your external IP) as well.
This tells you that there is something listening on port 25, from here
we can find out what it is, under linux, you can pass netstat the -p
flag that tells it to query the /proc filesystem to tell you which
process is doing the listening, issue the following.
netstat -anp | grep LIST | grep :25
The output should look something like..
[root@wibble steve]# netstat -anp | grep LIST | grep :25
tcp 0 0 0.0.0.0:25 0.0.0.0:*
LISTEN 10169/tcpserver
Here we can see on my box we are running a program called "tcpserver"
which is listening for inbound port 25 connections (SMTP) - in my case,
tcpserver is set to call qmail-smtpd which then looks after reciving
mail, yours may be something different.
you can also check out /var/log/messages and _usually_ /var/log/maillog
as well to see if there is any mail activity, this will also let you
know whats going on with the mail subsystem and should be the first port
of call when investigating "weirdness"
HTH,
--
Steve.
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