I am responsible for IT for a small charity and we have a problem with a few individuals who e-mail us on our hosted e-mail addresses. The individual is on btconnect and our server is also on BT broadband and using MSExchange. I understand that the message from [email protected] are generated by Exchange but can't tell whether this is a problem with our server (seems unlikely as most people send and receive e-mails perfectly well) or with the sender's server. I have copied a sample test message below and would be very grateful if somebody can explain what is causing this problem. I have * the personal details - hope that's acceptable but I don't want to compromise the individual's identity/security. ----- Original Message ----- From: "System Administrator" To: "****" <****.***@btconnect.com Sent: Tuesday, April 06, 2010 3:26 PM Subject: Undeliverable: Test Message Your message To: ***** Subject: Test Message Sent: Tue, 6 Apr 2010 15:25:59 +0100 did not reach the following recipient(s): ***@quiltersguild.org.uk on Tue, 6 Apr 2010 15:26:07 +0100 The e-mail account does not exist at the organization this message was sent to. Check the e-mail address, or contact the recipient directly to find out the correct address.