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OCI: Postfix Fails to send Emails with "warning: /usr/lib/sendmail and /us/sbin/sendmail differ"
in Linux
Applies to
Linux OS - Version Oracle Linux 7.0 and later
Oracle Cloud Infrastructure
Symptoms
Postfix shows the following warning error:
Oct 13 07:23:55 <hostname> postfix/postfix-script[18461]: warning: /usr/lib/sendmail and /usr/sbin/sendmail differ Oct 13 07:23:55 <hostname> postfix/postfix-script[18462]: warning: Replace one by a symbolic link to the other Oct 13 07:23:55 <hostname> postfix/postfix-script[18463]: starting the Postfix mail system
In addition, when trying to send mail via cron the following message can be seen
Oct 13 07:30:01 <hostname> CROND[20069]: (oracle) CMDOUT (/usr/sbin/sendmail: Exec format error)
Cause
There were two issues here:
1) /etc/alternatives/mta-sendmail was pointing to /usr/lib/sendmail.sendmail instead of /usr/sbin/sendmail.postfix
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