With a domain (only numbers) I have the problem, that the mails are bounced. I found this entries in the /var/log/mail.log:
Code:
Apr 3 20:52:17 server postfix/smtpd[2012]: connect from sender.domain.de[xxx.xxx.xxx.xxx]
Apr 3 20:52:17 server postfix/smtpd[2012]: setting up TLS connection from sender.domain.de[xxx.xxx.xxx.xxx]
Apr 3 20:52:17 server postfix/smtpd[2012]: Anonymous TLS connection established from sender.domain.de[xxx.xxx.xxx.xxx]: TLSv1 with cipher ADH-AES256-SHA (256/256 bits)
Apr 3 20:52:17 server postfix/smtpd[2012]: NOQUEUE: reject: RCPT from sender.domain.de[xxx.xxx.xxx.xxx]: 554 5.7.1 <0178@9513117.de>: Relay access denied; from=<xxx@senderdomain.de> to=<0178@9513117.de> proto=ESMTP helo=<sender.domain.de>
Apr 3 20:52:17 server postfix/smtpd[2012]: disconnect from sender.domain.de[xxx.xxx.xxx.xxx]
What could be the reason?