SubEthaSMTP

SubEthaSMTP is an easy to understand Java library that provides a receptive SMTP server component.

By plugging this component into your Java application, you can easily receive SMTP mail using a simple abstract Java interface.

Also included is a small sub-project called Wiser, an easy to use incoming mail testing framework.

Here are some key features of "SubEthaSMTP":

- A mailing list manager (ie, SubEtha Mail)
- A mail server that delivers mail to user inboxes
- A mail archiver like Mail Archive
- An email test harness (Implemented in this project. It's called Wiser.)

SubEthaSMTP was split out of the SubEtha Mail mailing list manager because it is a useful standalone component. When we wrote SubEtha, the last thing we wanted to do was write our own SMTP server. In our search for a modular Java SMTP component, we examined:

Apache JAMES
JBoss Mail Server
Dumbster
Jsmtpd
JES
Java Mail Server

Since you're reading this page you probably already know what we found: Six different SMTP implementations without the slightest thought given to reusability. Even Jstmpd, which purports to be a "A Modular Java SMTP Daemon", isn't. Furthermore, even though JBoss Mail is in active development, the team was unintersted in componentization of the SMTP processing portion of their server.

During the development of SubEtha's testing harness, we tried out the Dumbster software and found that not only was the API difficult to use, it did it not work properly, the developer has not done any development on it in about a year and it does not work reliably on Mac OS X. With two simple classes we re-implemented it as an included project called Wiser.

We hate reinventing wheels. This should be the LAST FREAKING JAVA SMTP IMPLEMENTATION.

What is new in this release:

• PlainAuthenticationHandlerFactory now accepts non-null authorization identities.
• The addition of Received headers is now configurable.
• The client now times out if the server does not respond.
• Wiser.messages is now protected so that subclasses can override it.

What is new in version 3.1.2:

• Much better TLS support.
• Support for the SIZE extension.
• Helo information is now available in MessageContext.
• A casing bug when running in the Turkish locale has been fixed.
• Better logging for muli-threaded environments.
• An issue with month formatting in SMTP exchange.
• This release hides dropped connection exceptions from logs.
• SMTPClient can now set the bind address, and has more logging.