Twitch don’t always respond with an email to limit increases, so check for yourself to see if you’ve been granted is_verified_bot or is_known_bot status using the endpoint https://api.twitch.tv/kraken/users/<CHANNEL_ID>/chat
If you haven’t been granted either status it could be that your bot doesn’t meet the requirements for that stuats (for example, there’s very few legitimate reasons for a bot used only on a few channels to need that status).