exchange email when server is turned off

Curious, I am managing my own mail on exchange and was wondering what happens to email when the server is off? I suspect the senders server keep trying the message and if it couldn't be delivered eventually return an undeliverable message right?

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Alan HardistyCo-OwnerCommented:
Yes - that's exactly what happens.
dazcoatesAuthor Commented:
Thanks Alan.
Alan HardistyCo-OwnerCommented:
The amount of time / number of days for a retry varies from server to server, but the average should be a day or two - maybe three.  Beyond that - the messages will be returned to sender and non-deliverable.
Alan HardistyCo-OwnerCommented:
You are welcome.

Thanks for the points.
You may want to set up a backup MX service if the server is going to be own for a length of time.
Also many spam washing services will hold the mail until it can be delivered.
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