Re: [Gmail-Users] Filter help

[Andy]

A Gmail filter cannot do what you want. Filters act on a message when
it arrives. They do not (can not) affect other messages that have
already arrived the previous day.

There may be ways to do that using a separate email client program
running on your PC, but not automatically with Gmail itself.

You can see the actions that are possible from filters, and comparing
message counts is not one of them.

You can use a Gmail search to select messages based on date, but I
don't think a filter can do that either.

Andy