Incoming email during an offline defrag

If I have to dismount a store to run an offline defrag, what happens to incoming mail destined for a mailbox that is offline?  I don't want the sender to receive an error message.
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resourcepcAsked:
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Rant32Commented:
The mail will be accepted by the SMTP service as usual and will be delivered as soon as the mail store is back online. No worry.
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r-kCommented:
It depends on the sender's mail server. Most servers are configured to keep retrying every 15 or 30 minutes for amywhere from 1 to 3 days. In most cases this is hidden from the sender and they will not see an error message.
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