Troubleshooting
Problem
A default sendmail configuration will do DNS queries for MX records, it does this even when its setup to use a Mail Relay Server for sending mail out. This will cause mail to fail if its not able to lookup the MX record.
Resolving The Problem
Setting up sendmail not to query DNS for MX records when using a DS (Smart Relay) consists of using "[ ]" brackets around the hostname Mail Relay Server configured in the /etc/mail/sendmail.cf.
#vi /etc/mail/sendmail.cf
Search for DS
Example:
DSnetmail.austin.ibm.com
change to:
DS[netmail.austin.ibm.com]
Save the configuration file...
refresh -s sendmail
[{"Product":{"code":"SWG10","label":"AIX"},"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Component":"Not Applicable","Platform":[{"code":"PF002","label":"AIX"}],"Version":"5.2;5.3;6.1","Edition":"","Line of Business":{"code":"LOB08","label":"Cognitive Systems"}}]
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Document Information
Modified date:
19 August 2022
UID
isg3T1011217