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I want to put the Exchange 2016 server into maintenance mode before rebooting it. The first command is to &nbsp;Drain the mail queues on the server. &nbsp;<br />
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Set-ServerComponentState EX16-1 -Component HubTransport -State Draining -Requester Maintenance<br />
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Question: &nbsp;What does it mean by draining the mail queues. &nbsp;What would this command do on server? I want to understand it practically . Can some one explain please.
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I want to put the Exchange 2016 server into maintenance mode before rebooting it. The first command is to  Drain the mail queues on the server.  

Set-ServerComponentState EX16-1 -Component HubTransport -State Draining -Requester Maintenance

Question:  What does it mean by draining the mail queues.  What would this command do on server? I want to understand it practically . Can some one explain please.

Drain the mail queues on the server.

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.