you need to set the external address as the default smtp in the AD.

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Diane Poremsky [MVP - Outlook]
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> When my users send mail to a mix of local and external contacts, the local
> address is always sent as a reply-to. When external contacts respond,
> obviously they can't resolve the local address.
>
> What do I have to do in order to force the reply-to address as 'not'
> local?
zen.master - 30 Jan 2008 12:51 GMT
thanks for the help!
At the AD, would that be a per user setting, or global?
> you need to set the external address as the default smtp in the AD.
>
[quoted text clipped - 4 lines]
> > What do I have to do in order to force the reply-to address as 'not'
> > local?
Diane Poremsky - 31 Jan 2008 01:02 GMT
Depends. If the eternal alias is the same as the user acct, you can
configure the address rules (recipient policy in ESM) to use any address as
the default -but if each person has an external alias that is not associated
in anyway with their username, you'll need to set it individually.

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Diane Poremsky [MVP - Outlook]
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> thanks for the help!
> At the AD, would that be a per user setting, or global?
[quoted text clipped - 8 lines]
>> > What do I have to do in order to force the reply-to address as 'not'
>> > local?