email threads

Storing my email in DTPO, running on Mavericks 10.9.3. Compared to the email client (Apple Mail) I see the number of (sub)threads significantly increased. Is there a way to simplify this?

For example:

A sends a question to an alias;
B replies to A and alias.

The reply will be a single mail in a sub thread of the main thread. This main thread contains the single mail with the question asked by A.

The amount of sub or sub-sub threading increases if other persons respond to this email or to an earlier respons.

I would like (perhaps since I am used to it :unamused: ) to have this all in one (chronological) thread. Believe I can see “all as if one thread” by selecting the thread, and all its sub threads. However that takes extra effort.