On FOSS zimbraRedoLogDeleteOnRollover is set to TRUE. Your welcome to change this, as long as you regular empty out the redolog/archive directory since there's no zmbackup to roll those into incrementals. (NE uses these to provide the ability to restore the server
down to the second of your choosing.)
On server start the primary redo.log is looked at for any uncommited transactions.
Several large customers actually use it for fast DR (keeping them in sync on another machine see zmplayredo) we plan to make this easier for the typical admin to setup in
Bug 11423 - disaster recovery through server to server sync (beta)
As you noted except for occasional chunks of email bodies, most of that redolog isn't human readable - if you want to see what's going on there's various levels of
logging - but since Domino/Exchange also use that term to mean features related to 'archiving' in some places, here's what you can do in Zimbra:
Note these first two options (forwards/BCC) can bounce and reveal themselves if the account being forwarded to is unavailable/down/closed (Zimbra's maintenance mode queue's mail at MTA, while locked/lockout still delivers mail).
always_bcc > all users in/out
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Enhancement Hacks - power of filters & always_bcc
recipient_bcc_maps & sender_bcc_maps > per user in/out
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[SOLVED] Automatically CC an account? Is this possible?
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[SOLVED] Monitoring email accounts legal intercept > web-client per user in/out via new envelope
-Can be used to catch 'drafts'.
-IMAP/POP/SMTP sends are
not included, it's intended for web-client monitoring only.
-Will eventually be extended to chats:
Bug 21761 - Legal intercept support: IM
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Legal Intercept - Zimbra :: Wiki ZAD (Zimbra Archiving & Discovery w/ Cross Mailbox Search) > covers all SMTP & web-client in/out via envelope expansion, with other features planned.
-Add-on that forks mail to archive accounts.
-Archives can exist on your server or an external system - though you don't benefit from single instance storage/x-mailbox search if using external non-Zimbra server. (An external ZCS server can have some benefit, but you'll have at least 2 copies.)
-Upcoming:
Bug 12697 - Other collaboration data (IM, Docs, Calendars) need to be archived
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Zimbra Archiving and Discovery Whitepaper.pdf
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Zimbra Archiving and Discovery Release Notes.pdf
(The add-on is now bundled in NE for easier setup - note that each archive mailbox you create uses a license count of course, so your given the option of purchasing additional mailboxes for archiving at a reduced cost.)