"Send On Behalf" doesn't work when forwarding messages

[EMESES]

Hi all,

"Send on behalf of" doesn't work when I want to forward messages, the forwarded message is sent with my address even if I fill the "From" field
with the other address.

I followed these step-by-step articles but in vain :
1-

http://support.microsoft.com/kb/327000/en-us

2-

http://support.microsoft.com/kb/281208/en-us

Thanks in advance.

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