Hi @NeueG. Thanks for being part of GoDaddy Community! It is possible that our servers received a large volume of spam from the twitter.com domain and it caused a temporary block. Blocks of that nature usually don't last very long. If you're still having this problem, I'd suggest reaching out to our support team so they can see if there are any issues with filtering out emails from Twitter.
JesseW - GoDaddy | Community Manager | 24/7 support available at x.co/247support | Remember to choose a solution and give kudos.