My work email is through gmail. I can be a bit of a night owl, and sometimes that means sending emails late at night (though I try to avoid work in the evenings, it doesn't always work that way). I LOVE the option to "send later" so the parent who whoever doesn't think that I'm available at all hours of the night, but I also don't forget to send that email. Instead I can look like an early riser if I want too!
