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Prayer is a small and fast HTTP to IMAP gateway written entirely in C.
* Uses persistent connections to IMAP server and support servers.
* Target folders remain SELECTed: not a simple-minded proxy.
* Full caching (including sort/thread cache) for each open folder.
* Up to five persistent IMAP connections (typically one or two in use):
o INBOX and one other folder
o Postponed message folder stream
o Preferences stream
o Folder transfer stream
o Various optimisations/sharing to minimise actual IMAP connections
* Directory cache: single round trip to IMAP server for directory listing.
* Works well with UW IMAP server (even using Unix format mail folders).
* Little discernible load on a Pentium III class system running Linux with
5,000 logins/day (400 logins/hour, 150 concurrent logins)
* Uses 10% to 20% of the CPU and 400 MBytes of RAM on a PIII class system
with 23,000 logins/day (1,700 logins/hour, 850 concurrent logins peak)
* Aggressive HTTP/1.0 and 1.1 connection caching to reduce SSL overhead.
* Optional gzip compression of pages tunable by IP address range.
* Minimal use of fixed length buffers in C source code.
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