Even when the e-mail addresses appear in the E-Mail Addresses tab of the 
person under EMC | Recipient Configuration | Mailbox on the Exchange 2007 
server, when entering that address in the From field in Outlook 2007, I get 
the following error bouncing back to the sender:

"You are not allowed to send this message because you are trying to send on 
behalf of another sender without permission to do so. Please verify that you 
are sending on behalf of the correct sender, or ask your system 
administrator to help you get the required permission."

Most users have several e-mail addresses each that they need to be be able 
to send from. Each address is unique for a given person (Real Person A has 
addresses A, B, and C, and mail sent to addresses A, B, or C all goes only 
to Real Person A). Users do receive messages successfully at all of their 
addresses. It's only a problem when trying to enter the addresses in the 
From field, so that they can reply from the proper address.

This was trivial in Lotus Domino/Lotus Notes. I'm sure there's a simple way 
to do this on Exchange/Outlook, but I couldn't figure it out. I am the 
Exchange Admin, so I can make any changes needed. How can I enable the 
system to let them send from their other addresses?

Thanks for any help,
Colin 

On Mon, 14 Dec 2009 11:54:19 -0500, "WebColin70"
<WebColin70XXXNoSpamXXX@live.com> wrote:

>Even when the e-mail addresses appear in the E-Mail Addresses tab of the 
>person under EMC | Recipient Configuration | Mailbox on the Exchange 2007 
>server, when entering that address in the From field in Outlook 2007, I get 
>the following error bouncing back to the sender:
>
>"You are not allowed to send this message because you are trying to send on 
>behalf of another sender without permission to do so. Please verify that you 
>are sending on behalf of the correct sender, or ask your system 
>administrator to help you get the required permission."
>
>Most users have several e-mail addresses each that they need to be be able 
>to send from. Each address is unique for a given person (Real Person A has 
>addresses A, B, and C, and mail sent to addresses A, B, or C all goes only 
>to Real Person A). Users do receive messages successfully at all of their 
>addresses. It's only a problem when trying to enter the addresses in the 
>From field, so that they can reply from the proper address.
>
>This was trivial in Lotus Domino/Lotus Notes. I'm sure there's a simple way 
>to do this on Exchange/Outlook, but I couldn't figure it out. I am the 
>Exchange Admin, so I can make any changes needed. How can I enable the 
>system to let them send from their other addresses?
>
>Thanks for any help,
>Colin 

Ah, you're looking at the wrong thing. What you are looking at is if
you have multiple AD accounts and mailboxes, each with a single email
address. Then it's a trivial matter of doing the whole  Send As thing
inside Exchange and just selecting the thing you want in Outlook.

If you want to do this without doing lots of accounts then you need
ChooseFrom, available from ivasoft.biz.

Exchange was never designed to do that job out of the box. Like all
software one product does one thing better and another focusses on
something differently.

Hmm, thanks, I guess. :-)

Not good news, but if it can't do it, it can't do it. At least I know to 
stop fighting with it.

Is that definitive - w/o a 3rd party application, or creating lots of 
independent Exchange accounts (which I won't do), I can't do what I want?

Thanks,
Colin

"Mark Arnold [MVP]" <mark@mvps.org> wrote in message 
news:vvrci5husv9ipn6pgq4vfp6k2drij57n2e@4ax.com...
> On Mon, 14 Dec 2009 11:54:19 -0500, "WebColin70"
> <WebColin70XXXNoSpamXXX@live.com> wrote:
>
>>Even when the e-mail addresses appear in the E-Mail Addresses tab of the
>>person under EMC | Recipient Configuration | Mailbox on the Exchange 2007
>>server, when entering that address in the From field in Outlook 2007, I 
>>get
>>the following error bouncing back to the sender:
>>
>>"You are not allowed to send this message because you are trying to send 
>>on
>>behalf of another sender without permission to do so. Please verify that 
>>you
>>are sending on behalf of the correct sender, or ask your system
>>administrator to help you get the required permission."
>>
>>Most users have several e-mail addresses each that they need to be be able
>>to send from. Each address is unique for a given person (Real Person A has
>>addresses A, B, and C, and mail sent to addresses A, B, or C all goes only
>>to Real Person A). Users do receive messages successfully at all of their
>>addresses. It's only a problem when trying to enter the addresses in the
>>From field, so that they can reply from the proper address.
>>
>>This was trivial in Lotus Domino/Lotus Notes. I'm sure there's a simple 
>>way
>>to do this on Exchange/Outlook, but I couldn't figure it out. I am the
>>Exchange Admin, so I can make any changes needed. How can I enable the
>>system to let them send from their other addresses?
>>
>>Thanks for any help,
>>Colin
>
> Ah, you're looking at the wrong thing. What you are looking at is if
> you have multiple AD accounts and mailboxes, each with a single email
> address. Then it's a trivial matter of doing the whole  Send As thing
> inside Exchange and just selecting the thing you want in Outlook.
>
> If you want to do this without doing lots of accounts then you need
> ChooseFrom, available from ivasoft.biz.
>
> Exchange was never designed to do that job out of the box. Like all
> software one product does one thing better and another focusses on
> something differently. 

On Mon, 14 Dec 2009 12:32:55 -0500, "WebColin70"
<WebColin70XXXNoSpamXXX@live.com> wrote:

>Hmm, thanks, I guess. :-)
>
>Not good news, but if it can't do it, it can't do it. At least I know to 
>stop fighting with it.
>
>Is that definitive - w/o a 3rd party application, or creating lots of 
>independent Exchange accounts (which I won't do), I can't do what I want?
>
>Thanks,
>Colin

If you want it definitive you can call Microsoft and raise a case with
them. They will give you the multiple account scenario because they
don't generally endorse 3rd party solutions.