Hello,

I have some mails from broken bots which do not have a "Date" header set. These are displayed with "Unknown" date, which is fine. But they are also displayed on the very top of the message list, if sorted for "Date of the most recent message in group". If sorted just for "Date" they are sorted at the very bottom. Note that this is a folder which does not contain any threads at all.

* Seems to be inconsistent behavior to me. Why does the sort order varies between "Date" and "Date of most recent message in group" if there are no groups?
* Usually I sort by "Newest message in group", but these dateless mails become a realy nuisance, because they are always displayed on top.
* Why not use an alternative date, such as the latest "Received" header if no "Date" is present?

Best Thanks!