On 8/21/2014 3:43 AM, Tony White wrote:
Hi folks,
Has anyone any idea why qmt has stopped reporting delivery failures please? I sent an email this afternoon and watch the log for send. The email delivery
attempt was made with a 451 error but nothing resulted in my mailbox.

Tony:

Error numbers in the 400's usually mean "retry later"
Error numbers in the 500's usually mean "it's dead, Jim"

Typically, there is no message generated when a 4xx return is encountered, as the message is simply re-queued and tried again later. (Unless/until the message times out).

I ran into a really nasty problem with this in an Exchange server, because the messages to a journalling host (think TAP) were failing due to SPAM control, but the errors (because it was a journalling rule) were always re-written to a 4xx message -- the result being the send queue getting EXTREMELY full!

I hope this helps.

Dan McAllister

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