I don't think many (if any) web services work that way. I know that at my company we set up a Postfix daemon on one of our servers which all of our web servers

I don't think many (if any) web services work that way. I know that at my company we set up a Postfix daemon on one of our servers which all of our web servers connect to to send mail. So, when you get your password emailed to you, it's Postfix doing the actual sending, and Postfix will retry for hours, let alone 5 minutes. Same thing for all my personal projects.