I'd like to have a "color column" in the list of messages. I'd like to be able to set the color independetnly for each message or to create a filter that sets it automatically by a rule. For instance, messages from my first work will be red, from my second work will be yellow, etc. 

Then I would have all my e-mails in one INBOX but still see which is which. Moving e-mails into subdirectories is not comfortable, especially if you use Android's client, because you have to swich among them to see new e-mails.

Reproducible: Always