Well search the logs for error/fatal/failure/severe, but you might check zmmailboxd.out for crash related material - we need some kinda error to work from.
Quote:
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ZCS Version: Zimbra 5.0.4 (Network Edition) on Ubuntu 6.06 LTS Server
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I would also apply the fix(s) as in
Bug 24897 - update /etc/pam.d/su on ubuntu so ulimits get set properly then note this post:
[SOLVED] Too many open files error after increasing zimbra_session_limit_imap