Hi Jerry! I'm currently working with my Team, the Chunky Cheetahs, to redesign our welcome emails. Right now there's no way to customize the emails unless you wanted to write your own service that looked for new users via the API and send a second email. I'd be curious, though, what are you looking to customize about the email? If you'd like more details on what that service might look like, I can also give you more details.