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Resolved Cannot recieve Emails / forward Emails

Do you have any related error messages in Plesk maillog?
 
connect to gmail-smtp-in.l.google.com[2a00:1450:400c:c06::1a]:25: Network is unreachable
This means your server is trying to connect to the Google SMTP via IPv6 protocol. This doesn't work as your network probably doesn't support IPv6.
To get rid of the error message, you can configure Postfix not to use IPv6 by editing your /etc/postfix/main.cf with this directive:

inet_protocols = ipv4

Then restart postfix:

/etc/init.d/postfix restart
 
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