Thanks for this. Your statement that SMTP is not a guaranteed delivery system is an answer. I've now actually received an error message back when attempting to send a subsequent message. It looks like the mx record held by our isp has some incorrect entries in it, and the message was timing out while attempting to be delivered to a no longer existent smtp mail server - see below:
----- Transcript of session follows ----- 550 5.1.2 <[EMAIL PROTECTED]>... Host unknown (Name server: smtpgtwy.bloggs.co.uk.: host not found) I'll get the mx record tidied up asap. I had asked the isp to confirm that the entries were correct a few days ago and they assured me that all was well.... David -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Ed Crowley Sent: 30 October 2001 03:04 To: Exchange Discussions Subject: RE: Missing email messages The answer is simple. SMTP is not a guaranteed delivery system. If something between the sender and the receiver malfunctions, the message can be lost. Now trace the entire route between the purported sender and the purported receiver, including the format of the message itself, and see if there is anything suspect. As you can see, your question is just impossible to answer. Ed Crowley MCSE+I MVP Tech Consultant Compaq Computer "There are seldom good technological solutions to behavioral problems." -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of David Lefebvre Sent: Monday, October 29, 2001 5:13 AM To: Exchange Discussions Subject: Missing email messages This may not be strictly an Exchange Server question, but I am interested in how a message can fail to be delivered and no error message is received by the sender. We run ES 5.5 SP4 on NT4.0 SP6. There have been no recent configuration changes apart from the installation of SP4. The system has been up and running satisfactorily for 2 years or more now. I had been advised that email had been sent to us and had not arrived, and no non-delivery report has been received by the sender. On Saturday last, the problem occurred to me while I was sending messages to the site from another internet mail account hosted at another ISP. Three emails were sent within a few minutes of each other, the first and third arriving correctly and speedily. The second did not arrive, and no non-delivery report has yet been received (now 2 days later). The first and third messages were to individual recipients at the site, the second message was to multiple recipients at the same site. Any thoughts would be most welcome. David _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Archives: http://www.swynk.com/sitesearch/search.asp To unsubscribe: mailto:[EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED] _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Archives: http://www.swynk.com/sitesearch/search.asp To unsubscribe: mailto:[EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED] _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Archives: http://www.swynk.com/sitesearch/search.asp To unsubscribe: mailto:[EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED]
