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How to fix postfix: Sender address rejected: need fully-qualified address (in reply to RCPT TO command))?

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http://serverfault.com – I've installed dovecot, postfix and roundcube on an ubuntu 12.04 box. The system is basically working - i.e it is able to send/receive mails to/from other domains. However, some domains cause the following error message in /var/log/mail.log Jul 15 01:59:21 one postfix/smtp[2019]: 0D0399C025F: to=<[email protected]>, relay=sm01.destdomain.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.destdomain.com[x.x.x.x] said: 504 5.5.2 <contact@localhost>: Sender address rejected: need fully-qualified address (in reply to RCPT TO command)) Do yo (HowTos)