Dear Sir, We are using cPanel on all of our servers. We have installed Zend Platform on one of our Web Server. We are using another server for email which also have cPanel installed. I have put my domain in Web Server into /etc/remotedomains and prevent emails from nobody also disabled. All emails are working fine but when Zend Platform sending an email to email@example.com i got following error. 2007-06-23 03:04:24 1I1vvD-00058J-VI <= firstname.lastname@example.org U=nobody P=local S=9716 T="Zend Platform Alert" from <email@example.com> for firstname.lastname@example.org 2007-06-23 03:04:24 1I1vvD-00058J-VI ** email@example.com F=<firstname.lastname@example.org> P=<email@example.com> R=lookuphost T=remote_smtp: SMTP error from remote mail server after end of data: host mail.xxxxxxxx.com [XX.XX.XX.XX]: 550 Administrative prohibition Remote Mail Server 2007-06-23 04:57:57 1I1xh7-0000d9-AT H=(server1.xxxxxxxx.com) [AA.AA.AA.AA]:52076 I=[BB.BB.BB.BB]:25 F=<firstname.lastname@example.org> rejected after DATA: syntax error in 'From:' header when scanning for sender: missing or malformed local part in "Zend Platform Reporter <>" Best Regards.