if you can receive but cannot send out e-mails then it is likely that your mail server requires you to give your username/password combination before it will allow you to send out e-mails. this is sometimes called smtp authentication. the username/password combination would be the same combination you would use when receiving e-mails. this is a safeguard against unauthorized use (sending out spam) of the mail servers.
you can configure outlook express to automatically authenticate with your mail server by performing the steps outlined below:
open outlook express and click on tools – accounts
you will then see the following dialog box
your screen may contain a different set of accounts but there’s usually only one account there. click on the account name and then click on “properties”. you will see the following
click on the “servers” tab and you will see
at the bottom there’s a check box labeled “my server requires authentication”. that should be checked and then click on “settings…”. you should see this image
your settings should look exactly like the one above. click “ok” twice and then click on close and you’re done.