Dear Expert,

I've follow the thread at but still got duplicate mail for some of my users.

I've changed zimbraMessageIdDedupeCacheSize like below,
[zimbra@collosus ~]$ zmprov gacf | grep zimbraMessageIdDedupeCacheSize
zimbraMessageIdDedupeCacheSize: 8192

Anything I can change to solve this duplicate problem since it always disturbing me

This problem cames when some one is a member of a list and somebody send an email to his mail and to the lists he will get 2 same mail on his inbox.

Please your help.

Donny Christiaan.