[LBBS-30] net_nntp: Complete overhaul/rewrite to use maildirs

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There are a lot of similarities between NNTP and IMAP/SMTP, which make relying on the mod_mail module a very logical choice to take care of many things for us.

Other mail servers have adopted the same philosophy, see https://www.cyrusimap.org/imap/reference/admin/nntp.html

• Rewrite to use maildirs (with dependency on mod_mail)
• use index file for each newsgroup to avoid directory traversals
• Somehow be able to "override" the UIDs to whatever the newsgroup article number is
• easily be able to provide (local) IMAP to NNTP proxy functionality, making newsgroup articles easily accessible from webmail programs

Improve:

• NNTP synchronization between multiple servers
• Add ability to relay all outgoing newsgroup messages to another NNTP server (sort of like the concept of message submission for NNTP)
• Mechanism for "post only" NNTP peering? Might want to be able to post directly to Usenet/newsgroups but not receive all incoming articles
• Add framework for sender authentication. Not part of NNTP, but perhaps could turn into a new RFC or standards.

See email exchanges with Phil Lapsley for more notes and ideas on this subject.

Also see:

• https://www.rfc-editor.org/rfc/rfc5537.txt

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