I can't see how it would be possible to create a link to delete the post that would be included in the email, not without a highly customised solution at any rate.
The people submitting posts to the site, are they registered users on the site?
I imagine you could have a page with a View that shows such posts where the author is the logged-in user, and the list of posts could include links to delete the posts. (The View would include a Query Filter to show posts whose author is the current user.)
The users would need to be logged in, and they would need to be authors of the posts (which is normally the case with the front end forms to publish posts).