Pointless? Methinks you've never worked with Mandrill or another service that penalizes you for hard/soft bounces. If you validate emails as complying to the e

Pointless? Methinks you've never worked with Mandrill or another service that penalizes you for hard/soft bounces. If you validate emails as complying to the email format used by those services, you can reduce your hard bounces to a bare minimum. If you check for a valid mail server at that domain, you can reduce that to 0. If you connect to their server and check for an error for that mailbox, you can reduce your soft bounces to 0 too, but that requires a lot of legwork to set up.