The error
was found in /var/log/maillog on the ZPanel linux server.stat=Deferred: 454 4.7.1 <*>: Relay access denied
The emails sent from the server was not arriving.
Issue was fixed by editing file:
then under "# network settings" section, you see line:vi /etc/postfix/main.cf
enter editting mode by hittin "a" key.mynetworks = all
append ",127.0.0.1" to that line so it is:
then save changes in the file and quit editor: Ctrl + C ; :wq ; Entrer keymynetworks = all,127.0.0.1
then i restarted postfix: service postfix restart
and when email was sent it arrived successfully to the destination mailbox.
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