On Thu, 26 Apr 2007, Tracy wrote:

> I have a user who is telling me that they attempted to send email to 
> various places and the emails are simply vanishing. One of the places is 
> to the place they work, and another was to Yahoo.
> 
> I've looked in my logs, and I see the mail coming into my server 
> (verified by the SMTP logs showing the sender as my local user and the 
> recipient as the remote user), and I see the SMAIL entry showing the 
> mail being delivered by SMTP - but I don't see any way to confirm that 
> the mail was actually delivered to Yahoo or to their work machine.
> 
> Where would I look to verify delivery? Does the fact that there's an 
> entry in the SMAIL log with delivery method "SMTP" mean that the 
> delivery attempt to the remote server was successful (meaning that there 
> was no SMTP error generated during the protocol session and there was no 
> DNS lookup or other transmission difficulty - I understand that mailbox 
> delivery on the other side cannot be guaranteed)?
> 
> Any ideas on where to look would be appreciated.

A record is logged inside the SMAIL log, *only if* the remote MTA returned 
a 2xx response at the end of the DATA transaction. At that point, it is 
the remote MTA responsibility to ensure the message is delivered through 
the next steps.



- Davide


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