I fully get writers are trying to show us they are eager and have a lot to offer so they send multiple projects in the same email, or multiple different emails with different projects.
But there is a problem to this.
If you were to just wait and hear response from us, the odds are you can make sure the later projects are not making the same mistake. Too often, the mistakes you made in manuscript 1, will be the same in 2, 3, and 4.
Wait for the letter. Make sure to make changes in the later stories and send that verison.
I would also add that it is too easy for us to just make a blanket rejection for all of the projects.
Just some words of advice.