Is there a way I can change the subject line (example, instead of Re:, I could put In Progress: or Done:) and not have Gmail split the "conversation" into a new email?

  • I see that gmail does not even add RE for me. are you trying to do this in an email client like outlook ?
    – clhy
    Commented Aug 5, 2015 at 22:34

2 Answers 2


No, there isn't. From Change how you see reply emails - Gmail Help

A conversation breaks off into a new thread if the subject line changes or the conversation reaches more than 100 messages.


I think they fixed this as of now (March 2024). As long as you don't delete a single letter from the original subject, you can add words and (at least for me) the messages are kept in the same conversation in Outlook.

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