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Editorial Team
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Asked: 2026-05-29T10:19:40+00:00

This the code, which works perfect in a unit test (connects to Gmail): Properties

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This the code, which works perfect in a unit test (connects to Gmail):

Properties props = new Properties();
props.put("mail.pop3.ssl.enable", true);
props.put("mail.pop3.host", "pop.gmail.com");
props.put("mail.pop3.port", "995");
javax.mail.Session.getDefaultInstance(props, null)
  .getStore("pop3")
  .connect("foo@...", "password");

When I run the same code in Tomcat7:

...
Caused by: javax.mail.AuthenticationFailedException: failed to connect
  at javax.mail.Service.connect(Service.java:332)
  at javax.mail.Service.connect(Service.java:176)
  at javax.mail.Service.connect(Service.java:196)

What is it about?

Well, I already configured META-INF/javamail.providers:

protocol=pop3; type=store; class=com.sun.mail.pop3.POP3Store;

And I have these Maven dependencies in WEB-INF/lib: javax.mail:mail:1.4.4 and com.sun.mail:pop3:1.4.4.

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1 Answer

  1. Editorial Team

    It’s not failing to authenticate, it’s failing to connect. The JavaMail FAQ has tips for debugging connection problems. Note also:

    • you should not need to touch the javamail.providers file
    • the POP3 provider is included in the javax.mail:mail artifact so you shouldn’t need a separate dependency for it
    • you shouldn’t need to set mail.pop3.port since it’s the default SSL port
    • you should use Session.getInstance instead of Session.getDefaultInstance
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