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Page 17: New Hermes architecture

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Slightly simplified diagram
Much clearer layering
Hardware architecture closely matches software architecture

Bottom-up description.

Message store partitioned onto 16 PCs
-- paired machines have copy of each other's data
-- replication engine copies data between pairs and to backup server
---- more about that later

Central mail hub is called ppsw
Proxy directs IMAP and POP connections to correct Cyrus machine
Exim routes email to Cyrus via LMTP

Historical jobs of ppsw:
-- route email within university
-- mailing lists, anti-spam, anti-virus
-- named after PP MTA

Omitted webmail and menu system / pine boxes
-- menu system still on old Hermes at the moment
-- still includes file store for attachments, pine config etc.

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