[Users] Message doesn't conform to MIME standard. It may render wrongly.

[Pierre Fortin]

Hi,

Lately, I'm seeing a growing spam which triggers CM to display:
"Message doesn't conform to MIME standard. It may render wrongly."
There hasn't been a single valid message with this warning; alll spam.

Is there a way to filter these? Guessing this message is triggered during
display after some serious parsing of the content.

Thanks,
Pierre