[ubuntu] Postfix/Roundcube: Sender address rejected: need fully-qualified address

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http://ubuntuforums.org – Hello, I've used tasksel to install the mail services on my brand new ubuntu 12.04 powered dedicated server. Further I've installed roundcube webmail client. The system is basically working (mails can be send/received using imap), expect when i trying to send an email to my isp, which causes the following error message in /var/log/mail.log Jul 15 01:59:21 one postfix/smtp[2019]: 0D0399C025F: to=<[email protected]>, relay=sm01.myisp.com[x.x.x.x]:25, delay=0.56, delays=0.4/0/0.06/0.1, dsn=5.5.2, status=bounced (host sm01.myisp.com[x.x.x.x] said: 504 5.5.2 <contact@localhost>: Sender add (Hardware)