To find current value
zmprov gcf zimbraMessageIdDedupeCacheSizeThe looks like as below
zimbraMessageIdDedupeCacheSize: 3000The modified value and zimbra mailbox service restart
zmprov mcf zimbraMessageIdDedupeCacheSize 0The conclusion
zmmailboxdctl restart
The solve problem, "zimbra duplicate message id", "zimbra duplicate emails". The commands use my post, support zimbra mail server version 8.6 8.5 8.0
Thanks for reading zimbra duplicate emails issue My blog Effortless Zimbra Mail Management: Unleashing the Power of Linux Commands, How-To, and Bash Scripts I hope this is useful.