How did you go about creating this? As in how do you find out about all these podcasts, topics, who's in it, etc?
simple marketing 101 Use an email address at your domain... you can easily have it forward to gmail behind the scenes, and replies will look as if they're coming from your domain. Can you imagine people at IMBD having email addresses on the gmail domain?
Interesting, seeing a gmail domain gives me more confidence that my email will get to the recipient.