Email sending issues outlook 2011 mac

I have mac with outlook 2011 and 3 emails configured. (1 x gmail and 2 x go daddy registered .com's)

It was working fine then just started having sending issues. (all 3 accounts at same time)

I can receive mail on all 3 accounts and can reply forward etc....but i cannot send new mail for any account.

I know that this is an smtp out issue and outlook thinks that there are no accounts associated with the emails but i have checked the settings SO many times for each account and they are correct!

I even tried deleting each account to see if it was this account that was causing the issue...but each time i still have the same problem with the remaining accounts.

Strangely, i have a second mac that was configured exactly the same...and outlook on both mac's were working fine...then started having the same issue at the same time.

Surely if all 3 accounts are not working at the same time on both macs then is it some kind of configuration issue in outlook??

Just to add that i am also running outlook 2008 on same mac using exactly the same settings (until i get the mail transferred over) and the accounts work fine on 2008 but not 2011!

Suggestions???

thanks.

e.