"then in theory I can use those in UE."
maybe, maybe not. the SMTP server may not accept the connection from a web script, or you may need to use Pear Mail if it requires authentication.
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.