We're mass enabling the zones that have asked for Beta access and will be going GA soon. Email me at celso@cf if you can't wait; we'll try to prioritize.
You can use the SMTP relay from other providers. The free tier should be enough for a personal account or two. For example AWS SES, Mailgun, Sendgrid, etc.
Otherwise this is a one way street, you can receive mail on your domain, but not send from it.