Are you viewing the page hosted on the remote server when sending an email from that server? or are you still on localhost?
Is this pear? You might want to try pear it may be better designed for remote email servers.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.