SpamAssassin rule
MPART_ALT_DIFF
Plain-text and HTML versions differ
+0.724 points
Body text test
What MPART_ALT_DIFF means
The plain-text and HTML parts of the message have different content.
The rule's description in SpamAssassin: “HTML and text parts are different”
How to fix it
Generate the plain-text part from the HTML so both contain the same text and links.
Does your email trigger MPART_ALT_DIFF?
Send it to a free test address: we run SpamAssassin, check SPF, DKIM and DMARC and show every rule with a fix.
Open the email spam checkerRelated rules
HTML_FONT_LOW_CONTRASTText color almost matches the background
HTML_IMAGE_ONLY_04Mostly images, almost no text
HTML_IMAGE_ONLY_08Mostly images, little text
HTML_IMAGE_ONLY_12Mostly images, little text
HTML_IMAGE_ONLY_16Many images for the amount of text
HTML_IMAGE_RATIO_02Low text-to-image ratio
HTML_MIME_NO_HTML_TAGHTML part without an <html> tag
HTML_SHORT_LINK_IMG_1Very short HTML with a linked image
MIME_BASE64_TEXTText hidden in base64
Frequently asked questions
What does MPART_ALT_DIFF mean?
The plain-text and HTML parts of the message have different content.
How do I fix MPART_ALT_DIFF?
Generate the plain-text part from the HTML so both contain the same text and links.
How many points does MPART_ALT_DIFF add?
0.724 points in the default SpamAssassin ruleset (network tests on, Bayes off). A message is treated as spam from 5.0 points. Mail servers can change scores locally.