The most common cause of emails not being sent is due to authentication errors with your email client and the platform. There is a wide variety of reasons your email may become unauthenticated.
- Did you recently change your password on your email?
- Did you update privacy or security settings?
- Did your email permissions change?
- Inactivity in the platform
If for any of these reasons the email becomes unauthenticated, you may start seeing errors populate the error log or campaigns not execute as expected. The first thing you should always try when you start seeing this behavior in the platform is to reauthenticate your email in the platform. More times than not, this will solve the errors.