Fix mailx config for el9

Dimitra Chatzichrysourequested to merge
deployment-el9-fix-mail into master

The config under /etc/mail.rc isn't being loaded.

s-nail checks for config files in /root/.mailrc and /etc/s-nail.rc.

Related MR: webeos-container!39 (merged)

Related ticket:https://cern.service-now.com/nav_to.do?uri=incident.do?sysparm_query=number=INC3659926

Edited by Dimitra Chatzichrysou

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