An Email API (Application Programming Interface) is a set of rules and protocols that allows software applications to interact with email servers in order to send, receive, and manage emails programmatically.

Email APIs provide developers with the ability to integrate email functionality into their own applications or services without needing to implement the entire email infrastructure themselves. This can include tasks such as sending transactional emails, managing email campaigns, retrieving email data, and more.

There are various types of Email APIs, including 

• SMTP (Simple Mail Transfer Protocol) 
• APIs for sending emails, 
• IMAP (Internet Message Access Protocol) 
•  POP3 (Post Office Protocol version 3) 

APIs for accessing and managing emails on mail servers, and specialized APIs provided by email service providers for managing email campaigns, tracking email analytics, and handling other email-related tasks.

Using Email APIs, developers can automate and streamline email-related processes within their applications, saving time and effort while providing users with powerful email capabilities.