Cannot send email due to 'javax.mail.NoSuchProviderException' SMTP error - Confluence User Guides and Documents

When Confluence tries to send mail, I get a "javax.mail.NoSuchProviderException: smtp" error.

The technical explanation is that you have two different versions of Sun's Javamail libraries in your application classpath. When Confluence tries to send an email, Java gets confused as to which version of the library it should be using, and falls over. If (and only if) you are encountering this error, try removing the Javamail-1.3.jar and activation-1.0.1.jar files from the confluence/WEB-INF/lib directory of your Confluence installation, and restarting the server. The problem should go away.

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