Jakarta Mail Guide: Configuration, SMTP Setup, and Email Sending

Jakarta Mail is a Java API for building email functionality, and the article explains how to install it through direct downloads or Maven and Gradle dependencies, then migrate older JavaMail projects by replacing dependencies and changing `javax.mail` imports to `jakarta.mail`. It demonstrates configuring an authenticated SMTP session, using Mailtrap credentials as an example, to send plain-text messages and then extends the approach to HTML email, multipart messages containing both HTML and plain text, multiple recipients including CC and BCC, file attachments, and embedded inline images. Because Jakarta Mail does not provide native asynchronous sending, the article recommends `CompletableFuture` for simple background tasks and `ExecutorService` with batching, thread pools, and rate limiting for larger bulk-email workloads. It also describes enabling the mail debug property to inspect SMTP connection, authentication, and delivery steps, while noting that Jakarta Mail supports broader capabilities through its documentation.

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