According to W3C Validator at <a the current feed has some minor issues:

<verbatim>
This feed does not validate.

    line 14, column 17: Invalid email address: drh (21 occurrences) [help]

              <author>drh</author>
                         ^

In addition, interoperability with the widest range of feed readers could be improved by implementing the following recommendations.

    line 42, column 123: title should not contain HTML: i (4 occurrences) [help]

        ... ; status still Open with 2 other changes</title>
                                                     ^

    line 189, column 2: Missing atom:link with rel="self" [help]

          </channel>
          ^


</verbatim>

Clearly the one that <em>should</em> be fixed is the "invalid email one". Following <a explanation</a> should not be hard - whenever we get only a user name (without domain), it is sufficient to append to it. This leaves us with a warning about lack of real name, which we can ignore.