I was excited to sign up for this. But, I never got your verification email, so I can't sign up. That should be your bread and butter.

We saw your sign up! Looks like your domain has greylisting enabled. Nothing we can do but obey that limit. You should get it if you try again or wait for our retry: Message was greylisted, try again in 1 minute 50 seconds

Ok nevermind, it showed up, but took longer than I expected.