It's actually that the xmail server accepts the connection but give a "user not available" response causing the message to fail. Here's a snippet (the names have been changed to protect the semi-innocent):

Your message did not reach some or all of the intended recipients.

     Subject:  Re: Schechter

     Sent:     6/4/2009 6:43 AM

The following recipient(s) cannot be reached:

     [email protected] on 6/4/2009 6:43 AM

There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.

           <esmail.esblah.blah.com #5.5.0 smtp;550 Recipient rejected>



Davide Libenzi wrote:
On Thu, 4 Jun 2009, Dale wrote:

I've found that when the root partition runs out of space that xmail still
answers smtp connections but since there isn't space it rejects the message.
Because the smtp conversation is accepted but the recipient is rejected the
sending server doesn't retry their message.

Uh?! And which SMTP client considers the message as being delivered, after having got a rejection anywhere in the SMTP transaction? A rejection anywhere in the transaction means, if the code is 4xx, that the message should be retried. ANY SMTP client that I'm aware of, do that. And if they don't, they are NOT SMTP clients.


- Davide


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