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I messed yesterday with my server permissions and now I can't have the smtp open.
Here is the dashboard monitor showing the smtp disabled. And here are the firewall rules. So I'm getting SMTP Error: RCPT TO command failed <x****@*****.xxx>: Temporary lookup failure 451 4.3.0

Thanks for your help

This is what I did to get postfix listening again
Edit /etc/postfix/master.cf
Remove the # symbol in front of the line:
#submission inet n - n - - smtpd
and restarted either with
service postfix restart
or postfix reload