How to Send HTML Emails in Java using SMTP or email API

Java developers can send and manage plain-text and HTML emails using JavaMail, SMTP, and email delivery services such as Mailtrap, which provides domain verification, transactional or bulk streams, monitoring, and testing capabilities. The process involves configuring SMTP properties including authentication, STARTTLS, host, port, and credentials; creating a JavaMail session; building a MimeMessage with sender, recipient, subject, and content; and sending it through the Transport class. The tutorial also explains how MIME multipart messages support embedded images through content IDs and file attachments through DataSource and DataHandler objects, while JavaMail can address multiple recipients in one message. As an alternative to SMTP, it demonstrates using Mailtrap’s Email API with OkHttp, where Java sends a JSON request containing email details and an authorization token to an API endpoint.

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