TZUTC: -0700
MSGID: 58793.sync_sys@1:103/705 2d6c97af
PID: Synchronet 3.21a-Linux master/88b423313 Sep 29 2025 GCC 12.2.0
TID: SBBSecho 3.30-Linux master/3b5271993 Oct 31 2025 GCC 12.2.0
BBSID: VERT
CHRS: ASCII 1
FORMAT: flowed
https://gitlab.synchro.net/main/sbbs/-/issues/1002#note_7830

The reason this feature isn't easy (and likely why it wasn't implemented
before) is that it's not until a QWK packet has been successfully downloaded
that we then would need to go back through the message bases and flag each
message that was included in the packet as read. This is already done for the
mail base (for email/netmail that was successfully downloaded via QWK) but not
for the sub-boards. It's easier for the mail base because there are no
pointers and the max-messages-per-packet limit likely wasn't reached, so all
the mail is scanned for unread and marked read.

It's doable for sub-boards too, but not trivial.
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