on my mail server i keep getting these log entries:
Oct 16 22:12:42 mx postfix/smtpd[3980]: NOQUEUE: reject: RCPT from <myhostname>: 450 4.1.8 <nut@omv.localdomain>: Sender address rejected: Domain not found; from=<nut@omv.localdomain> to=<myemailaddress> proto=ESMTP helo=<omv.localdomain>
any idea where i can change the sending address to a proper email address ?