After I restart the server and the pc when I send an email I got this "error":
Jun 22 21:42:50 linux postfix/smtpd[12744]: initializing the server-side TLS engine
Jun 22 21:42:54 linux postfix/smtpd[12744]: connect from unknown[201.215.213.14]
Jun 22 21:42:55 linux postfix/trivial-rewrite[12747]: warning: do not list domain subox.zapto.org in BOTH mydestination and virtual_mailbox_domains
Jun 22 21:42:55 linux postfix/smtpd[12744]: 23E46556B6: client=unknown[201.215.213.14]

Before the restarting the client was ok
what cold be the reason of this???
P.S. Im still able to recive and send mails