Ok, I think we've seen this problem with yahoo before. It doesn't always accept the default of 5 cached connections. I set it down to 4 and it didn't help. But setting to 3 forces tb to try to re-use existing connections when selecting a new folder like Trash without spinning up another 4th connection that apparently yahoo doesn't like. With cached set to 3 (advanced server setting) I don't see problems when selecting different folders like before (connection failed pop-ups) and the response is much better and Trash gets selected and marked deleted and expunged on shutdown.
Bug 1745205 Comment 19 Edit History
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Ok, I think we've seen this problem with yahoo before. It doesn't always accept the default of 5 cached connections. I set it down to 4 and it didn't help. But setting to 3 forces tb to try to re-use existing connections when selecting a new folder like Trash without spinning up another 4th connection that apparently yahoo doesn't like. With cached set to 3 (advanced server setting) I don't see problems when selecting different folders like before (connection failed pop-ups) and the response is much better and Trash gets selected and marked deleted and expunged on shutdown. **Addendum** Here's an example of a yahoo user reducing cached conns to 3 to fix a similar problem: bug 1595169 Note also that reporter Stan is on cox network. It possibly uses a yahoo backend server for email, not sure.