I remember back in BE 1.4.5, email was in the <author> tag, and it was a fake email address:
Here it is (from 1.4.5).
".nospam@nospam.") + " (" + publishable.Author + ")");
Many people complained about this. Here was one of the
threads. I think most people would prefer their actual email address not appear in the feed.
If the <author> tag is optional, then it might be best to omit it completely. Otherwise, we might make it an option I suppose, with the default being just the author's name (no email address). The fake "nospam" email address is
probably the worst option!