How to Send Emails in Java using SMTP and email API: A Step-by-Step Guide

Java email delivery can be implemented through several libraries and services, including Jakarta Mail, Spring Mail, Apache Commons Email, Simple Java Mail, and Mailtrap’s SMTP and Email API, with examples intended for Java SE 8 or later and a recommendation to use Java 17 or newer. Jakarta Mail offers broad support for SMTP, IMAP, POP, HTML and multipart messages, TLS, attachments, inline images, asynchronous delivery, and extensibility, while Spring Mail is positioned for Spring Boot applications, Apache Commons Email and Simple Java Mail for simpler integrations. The tutorial demonstrates configuring dependencies and SMTP credentials, then sending plain-text and HTML messages, addressing multiple recipients including CC and BCC, adding attachments and embedded images, and handling asynchronous or bulk delivery through CompletableFuture and ExecutorService. It also describes Mailtrap integration through authenticated SMTP streams or its Java SDK-based API, which supports transactional and bulk sending, HTML content, attachments, inline images, API tokens, and higher-volume delivery features such as suppression lists, dedicated IPs, and IP warm-up.

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