Our forum was created by importing a long running forum with 1.8 million posts, and about 34K user accounts. A great many of the user accounts are “dormant” in the sense that that account hasn’t been activated since we migrated to discourse.
If a user mentions or PMs one of those accounts I get a bounce (if the email address is no longer valid), but otherwise the mail goes out.
We don’t want to anonymize the historical posts, or deactivate any accounts (The historical content may include useful information and some of the users may come back), what I would like to be able to do is inform the user sending the PM that the account isn’t active.
Something like a popup which says:
“CodingHorror” hasn’t been active since 1998-3-4, so he probably won’t still be interested in buying hamsters"