It won't allow me to send my Welcome campaign as a "test" and I can't figure out what the hitch is. I have been sending other tests in the last few days that have been successful but this one won't send.
The reason that the Send Now button was remaining opaque is because there was a space after the Sender email and the Reply-to email. By removing them, Emma can validate those addresses and will allow you to send out those tests. The editor is very particular with those email addresses - maybe slightly too particular even - because getting those wrong can have quite a disastrous effect on delivery.
You should be good to go once you remove those spaces, but please let me know if you run into anything else or have any additional questions for me :)