I have an issue here inwhich a user can send emails to a specific user however they cannot turn around and send one back. The error msg is as follows: Reporting-MTA: dns; relais01.theirdomain.com Arrival-Date: Thu, 3 Nov 2005 09:41:16 -0500 Local-Spool-ID: S125850AbVKCOlQ Original-Recipient: rfc822;Stephanie.Leblond@mydomain.com Final-Recipient: RFC822;Stephanie.Leblond@mydomain.com Action: failed Status: 5.5.1 Remote-MTA: dns; mail.mydomain.com (xxx.xxx.xxx.xxx|25|xxx.xxx.xxx.xxx|50941) Last-Attempt-Date: Thu, 3 Nov 2005 09:41:17 -0500 Diagnostic-Code: smtp; 500 (Syntax error, command unrecognized) Any help is appreciated. Margo