how to send mails on local network from one computer to another computer
 

Hi,

How to send mail's in local network from one computer to another computer.

I have configured sendmail and dovecot in both computers,
both are in same domain,

my access(/etc/mail/access.cof) file configuration is same in both computer's i.e
Connect:suresh.com RELAY

Computer one :-
Hostname : admin.suresh.com
username : shiva

Computer two :-
Hostname : desktop4.suresh.com
Username : ramesh

Here I can send mail's in both computer's for their respective user's only, but I am unable to send mail from 1st computer to user of second computer.


Example's of how I am sending mail to different computer's
[root@suresh] mail -s "test" shiva@admin.suresh.com ----- working fine
[shiva@suresh] mail -s "test" root@admin.suresh.com ------ working fine

[root@suresh] mail -s "test" ramesh@desktop4.suresh.com ----- not working


Thanks
Suresh

So what does /var/log/maillog or equivalent say?

[root@admin log]# tailf /var/log/maillog

Nov 22 18:06:34 admin sendmail[11361]: qAMCaY9j011361: from=root, size=67, class=0, nrcpts=1, msgid=<201211221236.qAMCaY9j011361@admin.suresh.com>, relay=root@localhost
Nov 22 18:06:34 admin sendmail[11362]: qAMCaYmw011362: from=<root@admin.suresh.com>, size=358, class=0, nrcpts=1, msgid=<201211221236.qAMCaY9j011361@admin.suresh.com>, proto=ESMTP, daemon=MTA, relay=localhost.localdomain [127.0.0.1]
Nov 22 18:06:34 admin sendmail[11361]: qAMCaY9j011361: to=rajesh@desktop4.suresh.com, ctladdr=root (0/0), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30067, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (qAMCaYmw011362 Message accepted for delivery)
Nov 22 18:06:34 admin sendmail[11364]: qAMCaYmw011362: to=<rajesh@desktop4.suresh.com>, ctladdr=<root@admin.suresh.com> (0/0), delay=00:00:00, xdelay=00:00:00, mailer=esmtp, pri=120358, relay=desktop4.suresh.com. [192.168.10.201], dsn=4.0.0, stat=Deferred: Connection refused by desktop4.suresh.com.

So what does maillog say on desktop4.suresh.com?

Nothing,
Not generating any log's on /var/log/maillog of desktop4.suresh.com

Can you telnet to 192.168.10.201 and make it accept a message from the command line?

[root@admin ~]# telnet 192.168.10.201
Trying 192.168.10.201...
telnet: connect to address 192.168.10.201: Connection refused

Is the MTA running?
Else check the firewall?

Sorry..
at that time telnet server was not installed on desktop4.suresh.com.. so i installed it now
it was working now


[root@admin ~]# telnet 192.168.10.201
Trying 192.168.10.201...
Connected to 192.168.10.201.
Escape character is '^]'.
CentOS release 5.5 (Final)
Kernel 2.6.18-194.el5 on an i686
login: ramesh
Password:
Last login: Thu Nov 22 21:20:01 from admin.suresh.com
[ramesh@desktop4 ~]$

MTA is running fine
and firewall is disabled on both computers

OK, please remove the telnet server package. I should have spelled out you telnet from admin.suresh.com to desktop4.suresh.com on port TCP/25 to test if the MTA can be contacted and if it accepts a message:

Ok
Removed telnet-server from both admin.suresh.com and desktop4.suresh.com and then tried to connect telnet from admin.suresh.com to desktop4.suresh.com with port 25

[root@admin ~]# telnet desktop4.suresh.com 25
Trying 192.168.10.201...
telnet: connect to address 192.168.10.201: Connection refused

Is that the only line it returns or does it also say "telnet: Unable to connect to remote host: Connection refused" after that?

Now log in to desktop4.suresh.com, be root and post the output of:

When i am trying to connect telnet to desktop4.suresh.com from admin.suresh.com it is showing only
Trying 192.168.10.201...
telnet: connect to address 192.168.10.201: Connection refused,
But when trying to connect telnet from desktop4.suresh.com to admin.suresh.com it is showing
telnet: connect to address 192.168.10.53: Connection refused
telnet: Unable to connect to remote host: Connection refused

[root@desktop4 ~]# pgrep -lf sendmail
2282 sendmail: accepting connections
2290 sendmail: Queue runner@01:00:00 for /var/spool/clientmqueue

[root@desktop4 ~]# pgrep sendmail|while read P; do lsof -Pwlnp $P -ai; done
COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME
sendmail 2282 0 4u IPv4 7446 TCP 127.0.0.1:25 (LISTEN)

[root@desktop4 ~]# netstat -antlpe|grep sendmail
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 0 7446 2282/sendmail: acce

[root@desktop4 ~]# grep ^O.*Addr= /etc/mail/submit.cf /etc/mail/sendmail.cf
/etc/mail/submit.cf:O DaemonPortOptions=Name=NoMTA, Addr=127.0.0.1, M=E
/etc/mail/sendmail.cf:O DaemonPortOptions=Port=smtp,Addr=127.0.0.1, Name=MTA

Thanks
Suresh

So sendmail processes are running, except...


only the Mail Transport Agent (MTA) listens and not the Mail Submission Agent (MSA), plus the MTA has a default configuration because it only listens on the loopback device...


...which its configuration confirms. Sorry for the late reply but you need to add two lines to /etc/mail/sendmail.cf: one for the MTA to listen on the LAN IP plus one for the MSA (DaemonPortOptions=Port=submission).