How to Send Email in Java (SMTP & API)

Here is how to send email in Java so it actually reaches the inbox.

Your options in Java

JavaMail handles SMTP; for scale, POST to an email API and consume webhooks. (JavaMail (Jakarta Mail) for SMTP, or an HTTP client for an API.)

Make it land, not bounce

• Authenticate your domain with SPF, DKIM and DMARC.
• Send from a dedicated, warmed IP.
• Handle bounces and complaints via webhooks.

How Rainmail helps

Rainmail sends from your own domain on a dedicated, isolated IP with SPF, DKIM, DMARC, reverse-DNS and managed warm-up handled for you, plus a REST API and an AI watching deliverability — and it welcomes senders SES, SendGrid and Mailchimp reject, from $8. Run the free checker or see plans.