Here is an article about Deezer Notification Preferences, so if you want to receive notifications in the future ,then you need manage your notification settings on Deezer .
I think you'll have to activate Notification Preferences and then our Deezer community manager @Jaime.Deezercan help you if you want to receive Your month in music for December !
Later, if you no longer want to receive notifications, you can deactivate it .
@Cris_Fazano7 please contact ourDeezer Support Teamagain as they should be able to check in our system and see why you didn’t receive the email. Apologies for the inconvenience