SpamAssassin Rule: MIME_QP_LONG_LINE
Standard description: Quoted-printable line longer than 76 chars
Explanation
The Quoted-Printable encoding REQUIRES that encoded lines be no more than 76 characters long. See page 18: http://www.ietf.org/rfc/rfc1521.txt
Further Info
The default scores for this rule can be found in the online list of tests.