Testing two email versions to see which performs better.

The percentage of emails that fail to reach recipients.

A prompt encouraging users to take action.

The percentage of opened emails that receive clicks.

A series of automated emails sent over time.

Dividing an email list into targeted groups.

The percentage of recipients who open an email.

Customizing emails based on user data.

A measure of how likely an email is to be marked as spam.

The first email sent to new subscribers.