It's most likely coming from a stack trace generated by your application. The JavaMail API is vulnerable to header injection via the Subject header, and you're probably seeing that phenomenon (though by accident).

For my own application, I wrote a subclass of SMTPAppender that truncates the Subject header at the first EOL character, which prevents this issue from occurring.

Thanks, I figured it was something like this, but I didn't realize the problem with the subject line. Would this be appropriate to file as a JIRA issue?

jason

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Jason Bennett, jasonab@acm.org
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