450 4.1.8 Sender address rejected: Domain not found

[mezzomix]

Our newly installed Parallels Plesk Panel 10.3.1 logs these entries in /var/log/mail.info. I don't know how to fix this and I need help! Would you please give me some advice?

Sep 28 10:29:16 host01 postfix/smtp[19860]: 1AE52100071: to=<support@mydomain.com>, orig_to=<drweb@localhost.localdomain>, relay=ms01.hosting123.com[10.10.10.10]:25, delay=34078, delays=34077/0.03/0.17/0.11, dsn=4.1.8, status=deferred (host ms01.hosting123.com[10.10.10.10] said: 450 4.1.8 <root@host01.localdomain>: Sender address rejected: Domain not found (in reply to RCPT TO command))

/var/qmail/control/me

host01.hosting123.com

/var/qmail/control/locals

localhost
host01.hosting123.com

/etc/hosts

# hosts This file describes a number of hostname-to-address
# mappings for the TCP/IP subsystem. It is mostly
# used at boot time, when no name servers are running.
# On small systems, this file can be used instead of a
# "named" name server.
# Syntax:
#
# IP-Address Full-Qualified-Hostname Short-Hostname
#

127.0.0.1 localhost

# special IPv6 addresses
::1 localhost ipv6-localhost ipv6-loopback

fe00::0 ipv6-localnet

ff00::0 ipv6-mcastprefix
ff02::1 ipv6-allnodes
ff02::2 ipv6-allrouters
ff02::3 ipv6-allhosts
127.0.0.2 host01.hosting123.com host01
20.20.20.20 host01.hosting123.com host01

 

[mezzomix]

Problem solved. Postfix myorigin, myhostname, mydestination and mydomain were not properly configured.