Choices:
Note these first two options (forwards/BCC) can bounce and reveal themselves if the account being forwarded to is unavailable/down/closed (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'.
-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 or non-zimbra server.
-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