It’s a Final Notice.
In case you can’t read it, it says:
You submitted a request to terminate your Gmail mail account and the process has started by our Gmail™ Team, Please give us 3 working days to close your mail account.
To cancel the termination request reply to this mail.
All files on your Gmail mail including (Inbox, Sent, Spam, Trash, Draft) will be deleted and access to your Gmail™ mail account will be Denied.
If you wish to Terminate your Email Address, you can Sign Up for a new Gmail™ account.
For further help please contact by replying to this mail.
Gmail™ Account Services
Not really sure who I should reply to. Google Security, maybe? Interestingly, the actual return address is “Final Notice” and that address expands to:
I’m tempted to reply to them just to see what they want from me to keep my email active.