The other context would be asking for clarifying/asking a question etc about the subject of a previous email. Like this one:
“Hi Randi, I hope everything is well on your side. I wanted to follow up with you about the steering committee. I really need a chairperson for the subcommittee that will handle the strategic planning sessions. I think you are the ideal person to fill this role. Could we meet this week to discuss it further? (From another site)
Then the recipient of the above one could ask for more information about the subject/about it, ask for information relating to the matter in question. Etc. Further clarifying/comments about it, and so on.
It goes with the context, of course. So, there are other ways to answer your question and express what you want.