we recently had to reboot our Exchange (Exchange 2003 running GFI mail Essentials) server and one of my users received a 4.7.1 Delayed message.
He also said that the recipient never received his message.
The message was:
Diagnostic-Code: smtp;450 4.7.1 <firstname.lastname@example.org>: Recipient address rejected: Greylisted for 5 minutes
Will-Retry-Until: Wed, 14 Apr 2010 12:42:44 +0100
We have the GlitchRetrySeconds set to 0x00000078 (120 seconds)
The recipient in question is using a smarthost.
I have attached a screenshot of our Message Tracking Center which shows the message as only being sent once.
Can anyone shed any light on this please?