Hear, hear. We've been preaching the same at Mailgun. A lot of companies pay good money for affiliate lists, scrape web sites; basically do whatever it takes to get emails for marketing/spam. Yet, here are companies with permission to engage their users through email and they totally whiff. EVERY email you send should be considered an opportunity to increase engagement with your users. Tell them them that they can respond with questions, comments, whatever. Grubwithus does a good job of this. They specifically say in the body of the emails that you can provide feedback just by replying.
Email should be considered another interface into your application.
It just plain doesn't work now, you can't register new emails and the MX for it (mailgun) doesn't accept mail for it.
But the website is still up.
You might want to ask your question at a right place instead.
> I'm Little MOO - the bit of software that will be managing your order
> with us. It will shortly be sent to Big MOO, our print machine who will
> print it for you in the next few days. I'll let you know when it's done
> and on its way to you.
But the from mail it's firstname.lastname@example.org