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Relaying denied from localhost and domains hosted on server

CybrHost

New Pleskian
Fresh install of Plesk with Postfix, receiving Relaying denied errors from localhost and from domains and IP addresses hosted on the server thru Plesk... tried uninstalling/reinstalling postfix which did not work, qmail was broken also. Digging found that /etc/postfix/main.cf had nothing defined in mynetworks, ie.

mynetworks =

Manually adding 127.0.0.1 and the IP addresses of the server to that line and restarting postfix appears to solve the issue, but it seems that something is broken as shouldn't Plesk by default enable local emails? I am concerned that future updates or changes to Postfix thru the Panel may reset this back to broken..

Centos 6.6 64bit with Plesk 12.0.18 with all latest microupdates applied.

Any insight as to why this may be happening and how to permanently resolve? Thanks!
 
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