Easy!

If the link/email field is empty, or does not contain what looks like a valid email address, is just uses the value <data>@<boardname>.

Otherwise, if it detects a legitmate email address (HAH), it uses that.

Well, thats my cheap idea towards it anyway.

My idea in >>2 is only for the RSS template, and not for the XHTML document. I'll try to quickly cook up some coding ideas to make my idea work.