Iphone 3gs mail problem

[helehole]

so, i won 2, yes 2 iphones and i recived them yesterday,
i synced them with Outlook on my PC.
now, i got 2 mail accounts one of the iphones, one of these accounts can't send any mail's but it can recive mails, the other account can both recive and send mails, the two outgoing settings is simmelar and is almost set-up the same way.
how can i fix it?
sorry for my bad english...