Email threading issues in Gmail


  • Zsa Trias

    Hello Oriol!

    This seems to be a configuration on Gmail's side.
    I have found this relevant article from Gmail Help about how to Group emails into conversations.

  • Oriol Rius Valor

    Hello Zsa! Thank you for your help. I don't think this is on Gmail's side, as messages I send from Gmail do thread while messages I send from Zendesk don't.

    That being said, from the link you sent, I see that "A reference header with the same IDs as a previous message" is probably the criterion being changed by Zendesk.

    Any idea how to fix this? Thank you!

  • Zsa Trias

    Hello Oriol,

    Let me create a ticket on your behalf so we can troubleshoot this further.

  • Cesar Cantarella

    We are having the same issue here and getting complains from my users. 

    Have anyone found a way to solve this?

  • Dane
    Zendesk Engineering
    Hi Cesar,
    Regarding the threading issue. It's possible that some of your end-users have the conversation option turned off in their gmail accounts. Please have them turn it on and check the behavior again.
  • Andrew Johnson

    First, let's clarify the two different places where threading can happen:

    1. Threading in the sender's inbox (i.e. if you're Zendesk's GSuite / Google workspace connector, this refers to the inbox of the google workspace user that you've connected to).

    2. Threading in the receiver's inbox (i.e. your customers' inboxes)

    Oriol Rius Valor appears to be talking about #1. Cesar Cantarella is possibly talking about #2, but I'm not entirely sure. Maybe they can clarify that.

    I'm only going to mention #1 here -- the senders inbox. This appears to be something that only Zendesk can fix.

    When using the Gmail Connector in Zendesk, Zendesk uses the Gmail sending API to send messages via that account. When viewing the inbox of the sending account, the emails sent by Zendesk using this API are not properly threaded with the original conversation. The reason this is happening is that Zendesk is probably not specifying the ThreadId when using the gmail API's send() function. More information can be found here:

    And the relevant documentation from the Gmail API can be found here:

    Note, this "lack of threading in the sending mailbox" problem will occur even if you modify the Zendesk triggers to maintain the same subject line as the original message, because Zendesk still isn't setting the ThreadId properly. It would be very good if Zendesk could correct this, perhaps as part of this new configuration:

  • Edrolo

    We are also having this problem. This is not a change that our users have made - it's happening to lots of them. 

    I've also had some of them check and conversation threading is still turned on. 

    Can this be escalated? We are getting heaps of complaints about this. 

  • Dane
    Zendesk Engineering
    A ticket has been created for your concern. Please wait for an update from one of our Advocates. 
  • CJ

    Was there any resolution to this issue? 


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