Seamonkey Email Client, YahooMail SMTP Outgoing Mail

I created two accounts in SeaMonkey, one gmail and 1 yahoomail.

When I tried to send email from Yahoo (2nd account), a copy of that email was created in the Sent items (of course). But the problem is, there's also a copy in the Sent Items of the Gmail account (1st account).

I noticed that the SMTP is the same.

My question is, how do I change that, so that each account uses different SMTP of it's own.

Thanks.