Unable to send Password Expiry emails to outside addresses

Unable to send Password Expiry emails to outside addresses

I am able to send the expiry emails to addresses inside my domain, but cannot get them to send to outside addresses.  I have been on support calls twice, and they are not able to help.  They point to a "problem" with my Exchange server, without providing any suggestions as to what that problem might be, or how to get it to work.

(Exchange 2010; I am logging on to that server with a full admin account.  Our server is configured, of course, to send messages to any outside domains.)

Does anyone know how to get this to work?  I can't be the first.
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