Apache Sling Commons Messaging Mail

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Apache Sling

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Apache Sling Commons Messaging Mail

This module is part of the Apache Sling project.

This module provides a simple layer on top of Jakarta Mail 2.0 (package jakarta.mail) including a message builder and a service to send mails via SMTPS.

  • Mail Service: sends MIME messages
  • Message Builder: builds plain text and HTML messages with attachments and inline images
  • Message ID Provider: allows overwriting default message IDs by custom ones




Example factory configuration (SimpleMailServiceConfiguration) for SimpleMailService:

  "mail.smtps.from": "envelope-from@example.org",
  "mail.smtps.host": "smtp.example.org",
  "mail.smtps.port": 465,
  "username": "SMTP-USERNAME-PLAIN",
  "messageIdProvider.target": "(names=hostname)"

Optional MessageIdProvider

Example factory configuration (SimpleMessageIdProviderConfiguration) for optional SimpleMessageIdProvider:

  "names": [
  "host": "author.cms.example.org"


Create a multipart MIME message with an attachment (filename: song.flac) where the HTML part contains an inline image (cid: ska) and send it:

    MailService mailService;

    String subject = "Rudy, A Message to You";
    String text = "Stop your messing around\nBetter think of your future\nTime you straighten right out\nCreating problems in town\n…";
    String html = […];
    byte[] attachment = […];
    byte[] inline = […];

    MimeMessage message = mailService.getMessageBuilder()
        .from("dandy.livingstone@kingston.jamaica.example.net", "Dandy Livingstone")
        .to("the.specials@coventry.england.example.net", "The Specials")
        .attachment(attachment, "audio/flac", "song.flac")
        .inline(inline, "image/png", "ska")



Integration Tests

Integration tests require a running SMTP server. By default a GreenMail server is started.

An external SMTP server for validating messages with real mail clients can be used by setting required properties:

mvn clean install\
  -Dsling.test.mail.from.name=From\ Sender\
  -Dsling.test.mail.to.name=To\ Recipient\
  -Dsling.test.mail.replyTo.name=Reply\ To