Revert "we want to be more compatible with netart.pl imap server (second try)"

This reverts commit 6dee43f25c4115cb6e6b40a004a4fbc04374f85c.
Revert "check for NOT SEEN and UNSEEN posts exactly in such order"

This reverts commit afc99ae9b600d2611492e42b98dae20bd26e09e2.