Rsvp stands for in email

A common one!

In email, "RSVP" is an abbreviation for "Répondez S'il Vous Plaît", which is French for "Respond If You Please". It's a polite way to ask someone to confirm their attendance or response to an invitation, such as a party, event, or meeting.

When you receive an email with an RSVP request, it's usually accompanied by a deadline by which you need to respond, and you can respond with a simple "yes" or "no" to indicate your attendance or non-attendance.