I´m using: Version: 1.6 ST

My problem:

if someone starts a thread via e-mail this seems good. I get the new ticket. When I answer everything works properly. So far, all good. The problem is that I want my customers to respond via email and the answer will add to the existing thread (identified by ticket id) ...

How do I get this??

Please hlelp me! :)

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Keep the subject field like this:

*subject*

Then the system are able to track ID numbers...