lmtp - Not delivering message with duplicate Message-ID zimbra

 

lmtp - Not delivering message with duplicate Message-ID


outlook issues

How to deliver messages with duplicate ids


Resolution

To enable delivery of messages with duplicate ids, we would need to modify the zimbraMessageIdDedupeCacheSize attribute:

# su - zimbra
$ zmprov desc -a zimbraMessageIdDedupeCacheSize
zimbraMessageIdDedupeCacheSize
   Number of Message-Id header values to keep in the LMTP dedupe cache.
   Subsequent attempts to deliver a message with a matching Message-Id to
   the same mailbox will be ignored. A value of 0 disables deduping.


              type : integer
             value : 
          callback : 
         immutable : false
       cardinality : single
        requiredIn : 
        optionalIn : globalConfig
             flags : 
          defaults : 3000
               min : 0
               max : 
                id : 334

From this output we can see that the attribute can be only modified on globalConfig level.

To enable this on COS or account level you need to modify the zimbraPrefMessageIdDedupingEnabled attribute:

$ zmprov desc -a zimbraPrefMessageIdDedupingEnabled
zimbraPrefMessageIdDedupingEnabled
   Account-level switch that enables message deduping. See
   zimbraMessageIdDedupeCacheSize for more details.
 

              type : boolean
             value : 
          callback : 
         immutable : false
       cardinality : single
        requiredIn : 
        optionalIn : cos,account


Next, we find the current value:

$ zmprov gcf zimbraMessageIdDedupeCacheSize
zimbraMessageIdDedupeCacheSize: 3000

... modify it and restart mailboxd:

$ zmprov mcf zimbraMessageIdDedupeCacheSize 0
$ zmmailboxdctl restart


Be aware that this setting disables data deduplication.

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