Re-think message threads - it would be better for the threads to be formed by replies rather than by recipients

[FKlusmann]

It appears that messages are being added to a thread. by recipients or carbon copies.

I believe it would be better for the threads to be formed by replies rather than by recipients.

We may talk on different subjects which should not be threaded together with other subjects. 

An unwanted result is that messages on one subject are hidden in threads of another subject.

 Thank you.

[Jon]

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