Replies to a thread email in Outlook opens a new ticket if not replying to GLPI email itself

[SteadEXE]

Code of Conduct

• [x] I agree to follow this project's Code of Conduct

Is there an existing issue for this?

• [x] I have searched the existing issues

Version

10.0.16

Bug description

It happens a lot that people opens a ticket with their manager in the CC's, sometime the manager replies to the email and we end up having the original ticket with severals "RE: xxxx" ticket.

Relevant log output

No response

Page URL

No response

Steps To reproduce

1. Send an email from user A to helpdesk email with user B in CC.
2. Reply to user A's email with user B.
3. It creates two tickets.

Your GLPI setup information

No response

Anything else?

No response