This article describes some best practices to help prevent a legitimate mass email from being marked as spam.
Mass emails can be marked as spam by machine learning algorithms for any number of reasons. Some of these reasons include:
If you are planning to send an email to any number of recipients, here are some best practices to consider:
If you find yourself block from sending, please visit Restore Ability to Send Email in Exchange Online (vt.edu).
Self-Reporting Spam and Phishes
How to protect yourself from phishing attacks
Knowing your responsibilities when receiving an email that violates acceptable usage