メーリングリストモードでは、編集された投稿はメールで送信されません

[simon]

@waehlisch

only newly-created posts are sent via email.
when someone edits a post, changes are not sent via email.

I think this is by design and not a bug. Mailing list mode already generates a huge number of emails, so not sending new emails for edits may have been put in place to limit the number of emails that get sent.