How to deliver messages with duplicate ids || Mail duplicate || Reject

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One of our client was facing problem that one of their internal user

sends/forward mail to another internal user but receiver does not receive

the mail.

zimbra.log shows mail delivered to receivers mailbox.

mailbox.log shows receiver's mailbox rejected the mail

by detecting it as a duplicate email.


We could do following things:

check current cache size of zimbra:

$ zmprov gcf zimbraMessageIdDedupeCacheSize

zimbraMessageIdDedupeCacheSize: 3000 


Option-1

Increase the cache size

zmprov mcf zimbraMessageIdDedupeCacheSize 5000

zmmailboxdctl restart


Option-2

disable the Deduplication cache size

zmprov mcf zimbraMessageIdDedupeCacheSize 0

zmmailboxdctl restart


Ref: https://wiki.zimbra.com/wiki/How_to_deliver_messages_with_duplicate_ids

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