What could be a reason of HyperKitty failing to create a thread from chained emails?
For example, see "RECENTLY ACTIVE DISCUSSIONS" on page https://firstname.lastname@example.org/
"Openvpn and Network mapping" discussion displayed as five threads instead of only one...
Any ideas how to improve HyperKitty ability to detect threaded messages?
With my best regards, Danil Smirnov