I use Gnus in emacs as my mail service. Because I have several computers and many email addresses, I use an extra address to store my sent messages. Since I use gnus on several computers during the day, I want to sync my sent mail and to do so by pop3 downloading my sent mail to my archives.sent folder; so far, no problem. But now I want to make sure all those downloaded messages, while available in my sent folder, are not marked as unread; they should not call that attention to themselves.
Is there a simple way to use split mail (or something else) to mark them as read as soon as they are sorted? It would be a pain to have to use catch-up on them every time.
In this case, my goal is to prevent Gnus from highlighting "archive.sent" as a group with unread messages. This goal is satisfied by unsubscribing from the group, going to it in the message buffer and pressing u. Now it will not show up in the group list, even when unread messages are contained therein, unless I list all groups with L.