Not all ESPs love 3rd Party School Email Marketing Lists. In fact very few do.
K-12 Email Lists: Best Ways to Improve Email Communication
Your customers are well trained by your marketing actions. If you constantly discount they will wait until your next discount code hits the ecosphere.
Tips for School and District Email Communication to Parents.
Don't Get Complacent With Your Credit Card Payment Processing Provider.
"Don't You Forget About- Mail"