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2022-08-11doc: spell out "PROTOCOL" in examples
"PROTO" is probably ambiguous, and we'll use the same terminology as used in curl(1) documentation.
2022-07-20public-inbox-pop3d - a mostly read-only POP3 server
Old account expiry has not been implemented, but it seems to work well with both mpop(1) and getmail(1). The strictness of mpop was particularly helpful in ironing out bugs in our implementation of (dreaded) message sequence numbers. "EXPIRE 0" (RFC 2449) can theoretically save numerous "DELE" commands, but that's untested by real-world clients. mpop supports PIPELINING which is effective in hiding latency, and the core networking functionality is already well-tested from our NNTP and IMAP implementations. Configuration requires "publicinbox.pop3state" to point to a directory writable by the otherwise read-only daemon. See public-inbox-pop3d(1) manpage for more usage details.