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
    Aug 5, 2015 at 22:34

1 Answer 1


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.

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