rfc2047-encode-max-chars

rfc2047-encode-max-chars is a variable defined in `rfc2047.el'.
Its value is

76

Documentation:
Maximum characters of each header line that contain encoded-words.
According to RFC 2047, it is 76. If it is nil, encoded-words
will not be folded. Too small value may cause an error. You
should not change this value.