jodd-mail/src/main/java/jodd/mail/EmailUtil.java
public static String extractMimeType(final String contentType) {
		final int ndx = contentType.indexOf(';');
		final String mime;
		if (ndx != -1) {
			mime = contentType.substring(0, ndx);
		} else {
			mime = contentType;
		}
		return mime;
	}
public static String extractMimeType(final String contentType) {
		final int ndx = contentType.indexOf(';');
		final String mime;
		if (ndx != -1) {
			mime = contentType.substring(0, ndx);
		} else {
			mime = contentType;
		}
		return mime;
	}
TODO: should this always return lowercase or always uppercase?