Well thanks heaps for your help it appears as though we have managed to get to the bottom of the problem: When the email address is being generated by the 3rd party application, it is specifying the email type incorrectly. Instead of saying that the email is a SMTP type (or other valid format) it is placing a copy of the email address. Therefore when the email is being looked at by Exchange, the server has no idea what "type" of email this is, so it bounces it back. I confirmed it with help from Stephen when he sent me the complete header information - and noticed that the email address of the problematic one looked rather strange - right clicking on the address on the actual original email (that in turn bounced back) and selecting properties showed the above finding. Cheers again for your help Regards Troy P.S Stephen if you do want me to resend one of these e-mail's then let me know, however it will exhibit exactly the same symptoms as those we have been looking at. -----Original Message----- From: Stephen Hartley [mailto:shartley@xxxxxxxxxxxxxxxxx] Sent: Wednesday, 23 October 2002 3:07 p.m. To: [ExchangeList] Subject: [exchangelist] RE: Undeliverable Error http://www.MSExchange.org/ Would be curious to see the sent e-mail to me that failed. Resend to me and add this e-mail to it - steve@xxxxxxxxxxxxxxxxx <mailto:steve@xxxxxxxxxxxxxxxxx> This might prove the "Accpac padding theory". Stephen -----Original Message----- From: Troy Griffiths [mailto:tgriffiths@xxxxxxxxxxxx] Sent: Wednesday, October 23, 2002 10:52 AM To: [ExchangeList] Subject: [exchangelist] RE: Undeliverable Error http://www.MSExchange.org/ When I simply resend the mail - it fails with the same problem. If I resend, BUT type in the address myself it works fine. I have tried it with your address in the address line - however it failed, just like the other ones. I will forward 2 emails to you from the account in question. Cheers Troy -----Original Message----- From: Stephen Hartley [mailto:shartley@xxxxxxxxxxxxxxxxx] Sent: Wednesday, 23 October 2002 12:46 p.m. To: [ExchangeList] Subject: [exchangelist] RE: Undeliverable Error http://www.MSExchange.org/ What happens if you "resend" the mail (from the sent items folder)? From info you have given, there should be an attachment. Again, try sending to an external account and again you can send to me. I would also like to see two e-mails directly from that account, one straight text and one with an attachment (approx same size word doc that Accpac is trying to send) Stephen -----Original Message----- From: Troy Griffiths [mailto:tgriffiths@xxxxxxxxxxxx] Sent: Wednesday, October 23, 2002 8:43 AM To: [ExchangeList] Subject: [exchangelist] RE: Undeliverable Error http://www.MSExchange.org/ That is the strange thing - I have sent it to an external account, and it is the same (exactly the same apart from the email address being that of the external account) - still no headers though.....Could this be something to do with the issue?? It appears to be as though the email never gets past the mail server.......?? -----Original Message----- From: Stephen Hartley [mailto:shartley@xxxxxxxxxxxxxxxxx] Sent: Wednesday, 23 October 2002 11:43 a.m. To: [ExchangeList] Subject: [exchangelist] RE: Undeliverable Error http://www.MSExchange.org/ My apologies, I see what you mean (have never looked at the header of a sent item before!). From your e-mails, I see that you are sending to a local account. Try sending to an external "real" account (send it to me if you like - I don't think that a hotmail account will give us the info we need), then we can see if it is an internal or external issue. Stephen Hartley -----Original Message----- From: Troy Griffiths [mailto:tgriffiths@xxxxxxxxxxxx] Sent: Wednesday, October 23, 2002 8:20 AM To: [ExchangeList] Subject: [exchangelist] RE: Undeliverable Error http://www.MSExchange.org/ Stephen I presume you are talking about View->Options->then copy the Internet Header information. If this is the case - there is no detail in here(i.e. it is blank). If you can offer any thoughts on this they are appreciated - as the supposed experts from ACCPAC cannot decide what is happening - hence me trying to find out using this forum as a resource. Cheers Troy Disclaimer: The information in this electronic mail message together with any attachments is confidential. It is intended solely for the addressee. Access to this Internet electronic mail message by anyone else is unauthorised. If you are not the intended recipient, any disclosure, copying, distribution or any action taken or omitted to be taken in reliance on it is prohibited and may be unlawful. Linfox accepts no responsibility for any effects this email message or attachments has on the recipient network or computer system.