>One of my users has been getting quite a bit of "delivery failed"
>messages, however, when I check IMGate is that the messages are
>delivered.

check the maillog for how long these messages stay on the postfix 
queue, "delay=xxxx ..... status=sent"

>I assume this is simply a warning message, but it seems odd that one
>customer is getting so many since the final destination varies.

maybe only one customer is complaining

the "message delayed" warnings are pretty useless, cause support 
calls without helping anything, and can really mess up your queue 
when you have a 10K delayed msgs on the deferred queue then postfix 
adds in 10K "message delayed" warning messages to the queue.

Len




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