SpamAssassin Rule: SUBJECT_NEEDS_ENCODING
Standard description: none
The Subject: header line contains characters outside of the US-ASCII range that have not been encoded with Base64 or Quoted-Printable encoding. This violates the RFC standards for mail headers. Properly behaved MUAs would be expected not to do this.
The default scores for this rule can be found in the online list of tests.
MIME mail header encoding is defined in RFC 2047.