Email Service Integration (SMTP, APIs) is the process of connecting an application with external or internal email services to send, receive, and manage emails automatically through the backend system.
This integration can be done using SMTP (Simple Mail Transfer Protocol) servers or modern email APIs like SendGrid, Mailgun, Amazon SES, or similar services. SMTP is commonly used for direct email sending, while APIs provide more advanced features such as email tracking, analytics, templates, and higher deliverability.
It is widely used for sending verification emails, password reset links, notifications, invoices, and marketing emails. A properly implemented email service integration ensures reliable delivery, security, scalability, and fast communication between the application and its users.