As you may have noticed, the forums and website have been under heavy spam attack for the last few days.
As a side-effect tutorials notification are being sent through email.
PLEASE DON'T POST NEW TOPICS ABOUT THE SITUATION
Scirra is aware of it and are taking all the possible measures to get rid of the spammers.
You can go and read in this topic where all duplicates have been merged.
From the writing of this post, any topic or post on the subject found elsewhere than in this topic will just be deleted.
New tutorials submission has been taking down, but still the mailing queue from the server is still sending mails until it's emptied.
No need to send mail to the support as well, Scirra is fully aware of the situation and already doing everything they can.
Sorry for the inconvenience, thanks for your patience and comprehension.