SpamAssassin rule
MIME_HTML_ONLY
HTML only, no plain-text version
+0.1 points
Body text test
What MIME_HTML_ONLY means
The message only has an HTML part.
The rule's description in SpamAssassin: “Message only has text/html MIME parts”
How to fix it
Add a text/plain alternative with the same content (multipart/alternative). Most email tools can generate it.
Does your email trigger MIME_HTML_ONLY?
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 MIME_HTML_ONLY mean?
The message only has an HTML part.
How do I fix MIME_HTML_ONLY?
Add a text/plain alternative with the same content (multipart/alternative). Most email tools can generate it.
How many points does MIME_HTML_ONLY add?
0.1 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.