I confirmed that my problem was unrelated to log4j and SMTPAppender but was instead caused by geronimo-javamail-1.4_spec-1.3.jar. The geronimo-javamail .jar is distributed with Apache CXF and listed as a dependency for CXF, but a search shows that others have had mail formatting problems when using geronimo-javamail. I simply removed the geronimo-javamail jar from my path and my email problem was solved.
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