Hello, I bought a new NAS and want to allow it to send email alert in my zimbra email.
If I omit authentication postfix refuses to send the test message because the NAS hostname is not FQDN, then i have created a new email account for NAS and inserted authentication data into it but postfix refuse to accept the test message with only this output:

May 9 00:39:52 mail postfix/smtpd[21780]: connect from unknown[192.168.0.201]
May 9 00:39:52 mail postfix/smtpd[21780]: lost connection after EHLO from unknown[192.168.0.201]
May 9 00:39:52 mail postfix/smtpd[21780]: disconnect from unknown[192.168.0.201]

what's wrong?