Mail + Multiple accounts: doesn't respect selected FROM account

Hey all,

I spent almost 1 hour trying to find this problem on forums everywhere.
I found similar problems but not this one specially.

I have 3 accounts configured on my mail: hotmail, gmail, other.

When I write a new message there is a combo box where I can choose the account to use as "FROM".

The problem is that mail is not respecting the account I choose. It always send the e-mail using my gmail account even though I'm choosing to send it using hotmail account for example.

is there a solution for this problem ?

ty