I don’t know when Gmail started doing these for me but it was around the time I switched over to the new UI. Most likely this is one of the features of that new UI.
When I have not responded to an email that Gmail thinks is important, or when someone has not responded to an email from me that Gmail thinks is important, it resurfaces that email near the top of my inbox.
It looks like this:
The first email is a reply I sent to an email and the recipient has not responded in seven days. Gmail is suggesting that I follow up.
The second is a back and forth with my brother and I failed to reply to his latest. I just did. Thanks Gmail.
While this is a relatively small feature in the overall Gmail offering, I have found it quite useful in the month or two that I have had it.
Thanks Google.
