SYNOPSIS
loadplugin Mail::SpamAssassin::Plugin::MIMEEval
body MULTIPART_ALT_NON_TEXT eval:check_ma_non_text()
body MIME_HTML_ONLY eval:check_for_mime_html_only()
describe MIME_HTML_ONLY Message only has text/html MIME parts
DESCRIPTION
Utility functions for examining various MIME encoded message components.- has_check_for_ascii_text_illegal
- Adds capability check for ``if can()'' for check_for_ascii_text_illegal
- check_for_ascii_text_illegal
-
If a MIME part claims to be text/plain or text/plain;charset=us-ascii and the Content-Transfer-Encoding is 7bit (either explicitly or by default), then we should enforce the actual text being only TAB, NL, SPACE through TILDE, i.e. all 7bit characters excluding NO-WS-CTL (per RFC-2822).
All mainstream MTA's get this right.
- has_check_abundant_unicode_ratio
- Adds capability check for ``if can()'' for check_abundant_unicode_ratio
- check_abundant_unicode_ratio
-
A MIME part claiming to be text/plain and containing Unicode characters must be encoded as quoted-printable or base64, or use UTF data coding (typically with 8bit encoding). Any message in 7bit or 8bit encoding containing (HTML) Unicode entities will not render them as Unicode, but literally.
Thus a few such sequences might occur on a mailing list of developers discussing such characters, but a message with a high density of such characters is likely spam.
- check_for_mime
-
Check for various MIME properties.
Use in rules such as:
rawbody MIME_BASE64_BLANKS eval:check_for_mime('mime_base64_blanks') describe MIME_BASE64_BLANKS Extra blank lines in base64 encoding mime_base64_count mime_base64_encoded_text mime_body_html_count mime_body_text_count mime_faraway_charset mime_missing_boundary mime_multipart_alternative mime_multipart_ratio mime_qp_count mime_qp_long_line mime_qp_ratio mime_ascii_text_illegal mime_text_unicode_ratio
- check_for_mime_html_only
- Check for messages containing only text/html body parts
- has_check_qp_ratio
- Adds capability check for ``if can()'' for check_qp_ratio
- check_qp_ratio
-
Takes a min ratio to use in eval to see if there is an spamminess to the ratio of
quoted printable to total bytes in an email.