Hello again.
I think that you've effectively answered your own question. i.e. it seems that you've forgotten to enable authentication for the SMTP server. (It was mentioned in the last part of my old post which I linked to, honest!).
These instructions are for Outlook Express but Outlook (particular the older versions, like your one) is usually much the same:
Go to Tools > Account > Mail
(That might just be 'Tools > Email accounts' with Outlook Express).
Click on your Gawab account, to highlight it.
Click on 'Properties', then 'Servers'.
Towards the bottom of the panel, under 'Outgoing mail server', click to place a tick alongside 'My server requires authentication'.
While you're there check that your account name shows your
full email address. (If your address is
[email protected], that's also your username. It's
not just 'ron')
Click 'Apply' > 'OK' > 'Close'.
Cross fingers. Try again
Chris