pfqueue is an effort to give postqueue/mailq/postsuper/exim4 a console
(ncurses) interface: it won't add any particular functionality to those
provided with MTAs themselves, but will hopefully make them easier to
use.
It's a real-time queue scanner, that shows per-queue lists of existing
messages; the messages can be shown, deleted, put on hold, released or
requeued.
Just for example, it may be useful to inspect a traffic jam at a
given time, to see what is falling into and unexpectedly crowding your
deferred queue.
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