@email@example.com I’m also on the e-mail wagon here. On http://darch.dk/timeline/conv/oe3howa I have added a “Comment via email” botten if uses are not logged in. This feature could be extend to other places in the various UIs. Like we already got the “Does not follow your” / “Follow you” on the profile page in yarnd, so this detection could be used to sugget the user to email that person, when mentioning them.
@firstname.lastname@example.org hmm yeah, also not sure how this should work for multi-user pods. It should only trigger an email when it show that they do not follow you and, it should not be an automatic one. If spam becomes an issue you could use a forward email address for this feature.