Sending Email from PDA

I am using PocketPC 2003 on an iPaq and am trying to set up the Inbox email program. I am able to read emails through IMAP4, and I can send emails to my email addresses at Dreamhost.

I cannot send emails to any address outside of Dreamhost; the emails seem to disappear. The emails are not rejected back to me, and they are never received at the other email server.

I do have the outgoing server correct (as evidenced by being able to send to myself), and am using authentication on the outgoing server.

Any ideas?