Open-source Java projects categorized as SMTP

Top 5 Java SMTP Projects

  • Simple Java Mail

    Simple API, Complex Emails (Jakarta Mail smtp wrapper)

    Project mention: Guide to Send Emails in Java | | 2022-09-16

    Simple Java Mail

  • james-project

    Emails at the heart of your business logic!

    Project mention: How to improve third-party libraries with Kotlin extensions | | 2022-12-06

    While looking for a good solution to extract the HTML and text parts, I came across the following code hidden in the Apache James mail server: It has a 160-line class called MessageContentExtractor to extract the content as well as a 50-line inner static class called MessageContent, which is used to hold the data.

  • InfluxDB

    Access the most powerful time series database as a service. Ingest, store, & analyze all types of time series data in a fully-managed, purpose-built database. Keep data forever with low-cost storage and superior data compression.

  • GreenMail

    Official master for the Greenmail project

    Project mention: 7 Awesome Libraries for Java Unit & Integration Testing | | 2022-12-26

    i found for testing mail very usefull

  • TrashEmail

    A hosted disposable email telegram bot; Extremely privacy friendly; Proudly hosted for community.

  • davmail

    DavMail POP/IMAP/SMTP/Caldav/Carddav/LDAP Exchange and Office 365 Gateway - Synced with main subversion repository at

    Project mention: If you live in a two-party consent state and your employer refuses to be recorded or provide written documentation, can you get away with recording them secretly anyway, transcribing it, deleting the recording, and using the transcription as evidence in a legal case against your employer? | | 2022-11-25

    (Outlook/Exchange garbage can usually be checked out with either DavMail gateway or Owl add-on, the latter being paid-only)

  • Sonar

    Write Clean Java Code. Always.. Sonar helps you commit clean code every time. With over 600 unique rules to find Java bugs, code smells & vulnerabilities, Sonar finds the issues while you focus on the work.

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020). The latest post mention was on 2022-12-26.


What are some of the best open-source SMTP projects in Java? This list will help you:

Project Stars
1 Simple Java Mail 1,068
2 james-project 680
3 GreenMail 539
4 TrashEmail 498
5 davmail 434
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