Sending message selecting the SMTP server

[emag nioj]

Hello, i need to send a message in outlook using MAPI not CDO and i
want to choose the SMTP server when i have multiple accounts. How to
do? In outlook i can create a new message then i can use the button
Send Using .... But how to do it programmatically ? When i create a new
message in the outbox folder it uses the default account to send it. I
have all the accounts in IMO mode.
thnx a lot
bye