Get him to type your email in manually instead of using an address book . See if that makes a difference. S -----Original Message----- From: Joe DeRuvo [mailto:joed@xxxxxxxxxxxxx] Sent: Thursday, April 07, 2005 9:03 PM To: [ExchangeList] Subject: [exchangelist] RE: Unknown Address Error 550 - 5.2.1 Message Rejected http://www.MSExchange.org/ Steve: The user tried to send me an email with and without an attachment. He made a couple of attempts. I still was not able to receive them either way. Joe -----Original Message----- From: Steve Moffat [mailto:steve@xxxxxxxxxx] Sent: Thursday, April 07, 2005 4:47 PM To: [ExchangeList] Subject: [exchangelist] RE: Unknown Address Error 550 - 5.2.1 Message Rejected http://www.MSExchange.org/ Can this user normally send you email, can he send you emails without attachments, did he try sending it again? S -----Original Message----- From: Joe DeRuvo [mailto:joed@xxxxxxxxxxxxx] Sent: Thursday, April 07, 2005 8:41 PM To: [ExchangeList] Subject: [exchangelist] RE: Unknown Address Error 550 - 5.2.1 Message Rejected http://www.MSExchange.org/ Steve: The email address was correct - any other ideas? Joe -----Original Message----- From: Steve Moffat [mailto:steve@xxxxxxxxxx] Sent: Thursday, April 07, 2005 4:31 PM To: [ExchangeList] Subject: [exchangelist] RE: Unknown Address Error 550 - 5.2.1 Message Rejected http://www.MSExchange.org/ Wrong email address??...:)) -----Original Message----- From: joed@xxxxxxxxxxxxx [mailto:joed@xxxxxxxxxxxxx] Sent: Thursday, April 07, 2005 7:57 PM To: [ExchangeList] Subject: [exchangelist] Unknown Address Error 550 - 5.2.1 Message Rejected http://www.MSExchange.org/ We have an Exchange 2000 Server within our company. Our users have Outlook 2000 on thier PCs. Someone tried to sending me an email with a file attachment. I was not able to receive the email with the attachment. The sender instead received a message in their email: Subject: "Delivery Status Notification (Failure)" with the following Comment: The following message to <email address> was undeliverable. The reason for this problem: 5.1.0 - Unknown address error 550 - '5.2.1 Message rejected.' Any ideas of what would cause this or where to start troubleshooting? Thanks, Joe ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Exchange Newsletters: http://www.msexchange.org/pages/newsletter.asp Exchange FAQ: http://www.msexchange.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ Other Internet Software Marketing Sites: World of Windows Networking: http://www.windowsnetworking.com Leading Network Software Directory: http://www.serverfiles.com No.1 ISA Server Resource Site: http://www.isaserver.org Windows Security Resource Site: http://www.windowsecurity.com/ Network Security Library: http://www.secinf.net/ Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com ------------------------------------------------------ You are currently subscribed to this MSEXchange.org Discussion List as: ExchangeMailingList@xxxxxxxxxx To unsubscribe visit http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Report abuse to listadmin@xxxxxxxxxxxxxx The haggis is unusual in that it is neither consistently nocturnal nor diurnal, but instead is active at dawn and dusk (crepuscular), with occasional forays forth during the day and night. ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Exchange Newsletters: http://www.msexchange.org/pages/newsletter.asp Exchange FAQ: http://www.msexchange.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ Other Internet Software Marketing Sites: World of Windows Networking: http://www.windowsnetworking.com Leading Network Software Directory: http://www.serverfiles.com No.1 ISA Server Resource Site: http://www.isaserver.org Windows Security Resource Site: http://www.windowsecurity.com/ Network Security Library: http://www.secinf.net/ Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com ------------------------------------------------------ You are currently subscribed to this MSEXchange.org Discussion List as: joed@xxxxxxxxxxxxx To unsubscribe visit http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Report abuse to listadmin@xxxxxxxxxxxxxx ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Exchange Newsletters: http://www.msexchange.org/pages/newsletter.asp Exchange FAQ: http://www.msexchange.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ Other Internet Software Marketing Sites: World of Windows Networking: http://www.windowsnetworking.com Leading Network Software Directory: http://www.serverfiles.com No.1 ISA Server Resource Site: http://www.isaserver.org Windows Security Resource Site: http://www.windowsecurity.com/ Network Security Library: http://www.secinf.net/ Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com ------------------------------------------------------ You are currently subscribed to this MSEXchange.org Discussion List as: ExchangeMailingList@xxxxxxxxxx To unsubscribe visit http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Report abuse to listadmin@xxxxxxxxxxxxxx ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Exchange Newsletters: http://www.msexchange.org/pages/newsletter.asp Exchange FAQ: http://www.msexchange.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ Other Internet Software Marketing Sites: World of Windows Networking: http://www.windowsnetworking.com Leading Network Software Directory: http://www.serverfiles.com No.1 ISA Server Resource Site: http://www.isaserver.org Windows Security Resource Site: http://www.windowsecurity.com/ Network Security Library: http://www.secinf.net/ Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com ------------------------------------------------------ You are currently subscribed to this MSEXchange.org Discussion List as: joed@xxxxxxxxxxxxx To unsubscribe visit http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Report abuse to listadmin@xxxxxxxxxxxxxx ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Exchange Newsletters: http://www.msexchange.org/pages/newsletter.asp Exchange FAQ: http://www.msexchange.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ Other Internet Software Marketing Sites: World of Windows Networking: http://www.windowsnetworking.com Leading Network Software Directory: http://www.serverfiles.com No.1 ISA Server Resource Site: http://www.isaserver.org Windows Security Resource Site: http://www.windowsecurity.com/ Network Security Library: http://www.secinf.net/ Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com ------------------------------------------------------ You are currently subscribed to this MSEXchange.org Discussion List as: ExchangeMailingList@xxxxxxxxxx To unsubscribe visit http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Report abuse to listadmin@xxxxxxxxxxxxxx