Emails from same end user always thread into one ticket instead of creating new ones | Community
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Emails from same end user always thread into one ticket instead of creating new ones

  • September 14, 2025
  • 2 replies
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Hey team,

Bit of a weird one – we’ve got an end user who emails us daily, but every message just keeps landing in the same ticket instead of opening a new one.

  • The subject line stays the same, but the user says they’re sending fresh emails (not hitting reply).
  • Each day Zendesk just reopens that same ticket.
  • Looking at the raw email source, the messages are coming through Office 365 with Crossware in the mix, so I’m guessing the headers are making Zendesk think it’s all one thread.

Has anyone else seen this happen? Is there a way to make sure each new email from them spins up a brand new ticket (without asking the end user to add #new_ticket every time)?

2 replies

Elaine14
  • September 23, 2025
Hi Laura-Lee,
 
What you’re experiencing is a known behavior related to how Zendesk tracks email threads. Zendesk uses certain email headers like “Message-ID” and “In-Reply-To” to group emails into existing tickets. If Office 365 and Crossware are modifying these headers or if the emails appear as part of the same thread, Zendesk will treat them as replies and reopen the existing ticket instead of creating a new one.
 
To work around this without asking the end user to manually add #new_ticket every time, consider the following options:
 
  • Work with your email system admins to see if the headers can be adjusted or preserved in a way that Zendesk can recognize new conversations.
  • Use unique subject lines or content that help Zendesk identify these as separate requests, if possible.
 
Many community members have faced similar scenarios—sharing your use case in the Zendesk Community might also reveal additional creative solutions.
 
Hope this helps!

Elaine, we're seeing this happen even with different subject lines. 

For example:

INV123456 New Invoice from Acme Co. 

threads into the same ticket as:

INV321987 New Invoice from Acme Co. 

This, to me, is an issue with Zendesk logic, or having no consideration for varying subject lines. How can we adjust this?