Set the Content-Language header of this MimePart. Set the Content-MD5 of this part. Methods inherited from interface javax.mail. If the delimiter is null , only the first value is returned. MessagingException Get all header lines as an Enumeration of Strings.
Returns null if none present.
Returns null if none present. The Content-Language header is defined by RFC 1766. Returns null if this header is not available. The Content-Language header is defined by RFC1766. Note that there may be a performance penalty if text is large, since this method may have to scan all the characters to determine what charset to use.