Thunderbird: add possibility to change Theme of received mail

[post4inet]

Thunderbird:

Is it possible to add possibility to change Theme of received mail?

Example: Sender: 'John', Theme: 'Bill for components'

If I know that John works at AAA company, I prefer to change the Theme of received letter as 'AAA, bill for cable' to understand, what this letter is about without opening it.

[Jon]

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