How long do messages stay in SMTP queue?

We have 2 sites in our organisation with a Exchange server at each. One server is currently down and has been for a number of days. On the other sever, I can see the SMTP queue building up, but I think messages have been lost from the point where the failed server crashed. Is there a way to increasse the retention time or  get these messages back?
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By default 48hrs until permanent failure.

You can change the settings on the SMTP virtual server delivery properties.

Exchange System Manager --> ServerName --> Protocols --> SMTP Virtual server --> delivery

set time here.


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dannewtonAuthor Commented:
Thanks Shaun. I have set the expiration to 10 days  - we should be up and OK by then I hope? Do I need to do anything to make sure the server gets this change or is clicking "OK" enough?
No problem,

I would restart the Simple Mail Transfer Protocol service for good measure,


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