Hi I'm Eric

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Best to email feedback at day9.tv, but if needed you can always reach out to me at eric at day9.tv. Here's what I'd respond with:

Here are the most common causes of missed messages, try these first! If it still isn't working, let me know.

Double check here that you're an active subscriber: http://www.twitch.tv/settings?section=subscriptions 

Check your email spam filter.

Check your Twitch.TV messages here: http://www.twitch.tv/inbox

Make sure you have a verified email set up with Twitch - - http://www.twitch.tv/settings/profile

Check your Twitch.TV email settings - ensure 'Never send me email' and 'I receive a message' are not checked: http://www.twitch.tv/settings/notices