laravel mail, Error :(

[lucenarenato]

Swift_TransportException: Expected response code 354 but got code "554", with message "554 5.5.1 Error: no valid recipients

Swift_TransportException: Expected response code 354 but got code "554", with message "554 5.5.1 Error: no valid recipients
" in /var/www/app/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php:457
Stack trace:

[protito]

Are you running this in a remote machine? I get the same running remotely (haven't tried locally). Here are the logs

Nov 6 05:17:50 f158ffe8889a postfix/smtpd[281]: connect from unknown[192.168.0.99] Nov 6 05:17:50 f158ffe8889a postfix/smtpd[281]: NOQUEUE: reject: RCPT from unknown[192.168.0.99]: 454 4.7.1 <[email protected]>: Relay access denied; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<[127.0.0.1]> Nov 6 05:17:50 f158ffe8889a postfix/smtpd[281]: disconnect from unknown[192.168.0.99] ehlo=1 mail=1 rcpt=0/1 data=0/1 quit=1 commands=3/5