Starting in April 2024, Google will be implementing stricter guidelines for mass email senders. The goal is to protect Gmail users from receiving unwanted mass emails and enhance sender-side security. In a recent announcement, Google warned that senders who do not comply with these guidelines may experience an increase in message rejections.
This crackdown on mass email senders comes after reports of some senders receiving error messages related to messages sent to Gmail accounts. However, Google clarified that these errors were not new, but rather a result of pre-existing authentication requirements.