Sendmail not sending mail out from server anymore

Posted on 2008-11-12
Last Modified: 2013-12-18
I have an IBM AIX Unix server that runs my companies member database.  One of the functions is that it will email members reciepts when the sign up for programs online.  Previously, everything worked fine.  People registered, and then got their reciepts in their email.  Lately, some members have been complaining that they never recieved their reciepts.  We contacted the vendor of the software and they took a look at the system and later responded that sendmail was to blame.  They recommended I do "sendmail -v <email address>".  The result of the command is shown in the code window.  Previously, it only listed smtp.secureserver and mailstore1.  However our domain uses server, so I added that to the list of MX records with a priority of 10 and changed the other two to 20 and 30.  That change netted result shown.  I am wondering if it is due to port settings?  Is sendmail using port 25 to send the mail?  I know that when configuring outlook for employees we use for outgoing server and use port 80 (not the default 25) for the port.  I tried going into and adding the line:

"O DaemonPortOptions=Port=80"

which did not help...

Any suggestions?
# sendmail -v                                       

.                                                                        Connecting to via esmtp

...                                                                      Connecting to via esmtp...

                                                                         Connecting to via es

mtp...                                                                   Deferred: Connection refused by                                                                     


Open in new window

Question by:dumpsterdivingdave
    LVL 26

    Expert Comment

    Where is this AIX server located in relation to the other servers? I know the machines are hosted at godaddy, is that where you host this AIX server too? Are these receipt emails going to people at your domain or external domains? Does this AIX server deliver mail directly or use a smarthost (like one of those godaddy mail servers)?
    LVL 5

    Author Comment

    The AIX server is located at out main site.
    The reciepts are going to email addresses both inside and outside of the organization.  Most of them go outside of the organization.
    To my knowledge, the AIX server does not deliver any mail directly.  The sendmail is only used to get the reciept to the godaddy hosts where their servers then deliver the message to the correct domain/person.
    LVL 5

    Accepted Solution

    It ended up being the firewall that started to block port 25 for some reason.  After re-configuring, sendmail is now sending emails....  Including the 3900 or so that have been backed up for the past month.

    Write Comment

    Please enter a first name

    Please enter a last name

    We will never share this with anyone.

    Featured Post

    IT, Stop Being Called Into Every Meeting

    Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

    About FreeBSD Jails In FreeBSD, jails are a way of doing operating system level virtualization.  The basis of FreeBSD jails is chroot (, which changes the root directory of processes.  As a…
    Easy CSR creation in Exchange 2007,2010 and 2013
    Learn how to find files with the shell using the find and locate commands. Use locate to find a needle in a haystack.: With locate, check if the file still exists.: Use find to get the actual location of the file.:
    This video shows how to set up a shell script to accept a positional parameter when called, pass that to a SQL script, accept the output from the statement back and then manipulate it in the Shell.

    759 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    10 Experts available now in Live!

    Get 1:1 Help Now