I have accumulated thousands of incoming e-mails in my Inbox folder. Most of
these come from maillists or from spam. Now I would like to delete some.
I want to delete all messages that I have NOT read,
and keep all messages that I HAVE read.
The reason is that if I have read them, they were interesting to me at the
time they came in, and I may want to consult them again. If I didn't read
them at the time, I don't ever want to read them.
I know it IS possible to delete a group of messages by sorting on the
appropriate column display. For example, I can sort on the "Received" column
and delete all messages prior to a given date. If there were a column called
"Read", then I could divide the messages between "Read" and "Not Read", and
delete the "Not Read" ones.

P.S. It would also be satisfactory to send the "Read" messages into a
separate folder.

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