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 smtpout.secure 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 smtpout.secureserver.net for outgoing server and use port 80 (not the default 25) for the port. I tried going into sendmail.cf and adding the line:
which did not help...
# sendmail -v email@example.com
firstname.lastname@example.org... Connecting to smtpout.secureserver.net. via esmtp
email@example.com... Connecting to smtp.secureserver.net. via esmtp...
firstname.lastname@example.org... Connecting to mailstore1.secureserver.net. via es
email@example.com... Deferred: Connection refused by mailstore1.secure