Email not sending Postfix

Hello try to make postfix server, all config everything I set, earlier I went in postfix order was no problem but suddenly something happens and does not work when sending mail via squirrelmail thus still loading (no timeout) just keeps loading. In what could bt problem?

thank you

 

Are there any errors in your mail log (in the /var/log/ directory)?

 

elnet flycloud.eu 25
Trying IP...
Connected to server***.
Escape character is '^]'.
220 SERVER**** ESMTP Postfix (Debian/GNU

MAILQ:

 

Yes setting them all.

 

Currently it send but not receive, log is clean.

Main.cfg

 

And Gmail email me back.

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 554 554 5.7.1 <[email protected]>: Relay access denied (state 13).

 

Escape character is '^]'.
220 hostnameserver.eu ESMTP Postfix (Debian/GNU)
MAIL FROM:<[email protected]>
250 2.1.0 Ok
rcpt to:<[email protected]>
554 5.7.1 <[email protected]>: Relay access denied

 

Is MySQL working? Are the MySQL details in /etc/postfix/mysql-virtual_domains.cf correct?