spam assassin rules

HTML_IMAGE_ONLY_28

What HTML_IMAGE_ONLY_28 means and how to avoid it

This error means that your email has only 2000-2400 bytes' worth of words and at least one image. You want at least 3200 bytes to not be flagged (which, to be clear, is still not that many words.)

Note that this error will trigger even if the only image in your email is a tracking pixel!

Want to learn more? You can find the full list of SpamAssassin rules here, or the source code for this specific rule here.
No credit card required. Only pay for what you use. Cancel anytime.