Thank you Sir, let me post my /var/log/mail.log while I was sending the message it's here:
Feb 5 17:41:31 TTTFirewall postfix/smtpd[17183]: connect from unknown[72.46.136.227]
Feb 5 17:41:40 TTTFirewall postfix/smtpd[17529]: connect from unknown[113.161.64.40]
Feb 5 17:41:40 TTTFirewall postfix/smtpd[17529]: setting up TLS connection from unknown[113.161.64.40]
Feb 5 17:41:40 TTTFirewall postfix/smtpd[17529]: Anonymous TLS connection established from unknown[113.161.64.40]: TLSv1 with cipher RC4-MD5 (128/128 bits)
Feb 5 17:41:40 TTTFirewall postfix/smtpd[17529]: NOQUEUE: reject: RCPT from unknown[113.161.64.40]: 554 5.7.1 <unknown[113.161.64.40]>: Client host rejected: Access denied; from=<
catchall@gheonline.com.vn> to=<
it.tech78@yahoo.com> proto=ESMTP helo=<mailsrv>
Feb 5 17:41:40 TTTFirewall postfix/smtpd[17529]: disconnect from unknown[113.161.64.40]
Feb 5 17:41:40 TTTFirewall dovecot: pop3-login: Login: user=<
catchall@gheonline.com.vn>, method=PLAIN, rip=113.161.64.40, lip=123.30.108.56, TLS
Feb 5 17:41:40 TTTFirewall dovecot: POP3(
catchall@gheonline.com.vn): Disconnected: Logged out top=0/0, retr=0/0, del=0/0, size=0
Feb 5 17:41:43 TTTFirewall postfix/smtpd[17181]: connect from tx2ehsobe005.messaging.microsoft.com[65.55.88.15]
Feb 5 17:41:43 TTTFirewall postfix/smtpd[16822]: connect from mx1.quoniam.de[217.110.39.61]
Feb 5 17:41:43 TTTFirewall postfix/smtpd[17181]: setting up TLS connection from tx2ehsobe005.messaging.microsoft.com[65.55.88.15]
Feb 5 17:41:43 TTTFirewall postfix/smtpd[16822]: setting up TLS connection from mx1.quoniam.de[217.110.39.61]
Feb 5 17:41:44 TTTFirewall postfix/smtpd[17181]: Anonymous TLS connection established from tx2ehsobe005.messaging.microsoft.com[65.55.88.15]: TLSv1 with cipher RC4-MD5 (128/128 bits)