sendmail[9855]: daemon MTA: problem creating SMTP socket + LINUX

Hey Friends,

Today we faced a different problem in sendmail configuration in linux. We installed and configured sendmail. started the service of sendmail. the mails were not getting delivered. where we have made entry in exchange server too.

We look at the error in /var/log/maillog. the error was as below:-

[@ log]# tailf maillog
Apr  3 15:35:45  sendmail[9855]: daemon MTA: problem creating SMTP socket
Apr  3 15:35:50  sendmail[9855]: NOQUEUE: SYSERR(): opendaemonsocket: daemon MTA: cannot bind: Cannot assign requested address
Apr  3 15:35:50  sendmail[9855]: daemon MTA: problem creating SMTP socket
Apr  3 15:35:55  sendmail[9855]: NOQUEUE: SYSERR(): opendaemonsocket: daemon MTA: cannot bind: Cannot assign requested address
Apr  3 15:35:55  sendmail[9855]: daemon MTA: problem creating SMTP socket
Apr  3 15:36:00  sendmail[9855]: NOQUEUE: SYSERR(): opendaemonsocket: daemon MTA: cannot bind: Cannot assign requested address
Apr  3 15:36:00  sendmail[9855]: daemon MTA: problem creating SMTP socket
Apr  3 15:36:05  sendmail[9855]: NOQUEUE: SYSERR(): opendaemonsocket: daemon MTA: cannot bind: Cannot assign requested address
Apr  3 15:36:05  sendmail[9855]: daemon MTA: problem creating SMTP socket
Apr  3 15:36:05  sendmail[9855]: NOQUEUE: SYSERR(): opendaemonsocket: daemon MTA: server SMTP socket wedged: exiting
^C
[@ log]#

 after googling and reading some document, came to know that another service was also running on port number 25, which is SMTP port. we had a glance at
#netstat -an |grep -i 25
#netstat -an |grep -i smtp

etc, last we checked POSTFIX services which were running on the server at port number 25. we stopped that and the error went. at last RESOLUTION of the error came.

[@ log]# ps -ef |grep -i postfix
      2023     1  0 Feb22 ?        00:00:38 /usr/libexec/postfix/master
postfix   2032  2023  0 Feb22 ?        00:00:03 qmgr -l -t fifo -u
postfix   9283  2023  0 15:04 ?        00:00:00 pickup -l -t fifo -u
      9960  9125  0 15:41 pts/1    00:00:00 grep -i postfix
[@ log]# /etc/init.d/postfix status
master (pid  2023) is running...
[@ log]# /etc/init.d/postfix stop
Shutting down postfix:                                     [  OK  ]
[@ log]#

after this started services of sendmail. before stopping the services please confirm whether the server owner or application team is using postfix ! if yes then go accordingly.

Love Sharing
Amit Chopra