> Why can't some emails get through to me and bounce back to the sender
> - this is the usual comment "delivery to the following recipients has
> been delayed/has failed". Usually this is from a hotmail account.
That's typically a server-side issue. Your mail server wants to delivery
mail to the recipient's mail server, but it's not available at the time.
Since mail is a store-and-forward operation, your message should be
delivered when the remote server is available again.

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Brian Tillman [MVP-Outlook]