java.lang.NoClassDefFoundError: gnu/inet/util/LineInputStream

I'm facing an exception:
        java.lang.NoClassDefFoundError: gnu/inet/util/LineInputStream
	javax.mail.internet.MimeUtility.<clinit>(MimeUtility.java:782)
	javax.mail.internet.InternetAddress.setPersonal(InternetAddress.java:221)
	javax.mail.internet.InternetAddress.<init>(InternetAddress.java:137)
	javax.mail.internet.InternetAddress.<init>(InternetAddress.java:123)

com.enginegreen.denali.domain.usercontext.UserContextImpl.initEmailAddress(UserContextImpl.java:186)

On debian with installed:
   libgnumail-java                   1.1.1-2 

The application in question is just setting up a simple email address, with
code that works on the sun javamail:

this.emailAddress = new InternetAddress(this.member.getEmail(),
                                                       
this.member.getFirstName() + " " + this.member.getLastName());

I've searched this forum, and google, but not found any clues.  What might I
be missing?
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