why it would appear"Invalid spam contents"

[Jack Pan]

When I post blog, it appears"Invalid spam contents. Please contact Nabble Support if this is a mistake."
Could you tell me why?

[Hugo <Nabble>]

You are using a combination of words that is considered spam by our detector. Please send the message you want to post to: h u g o [at] n a b b l e [dot] c o m.

I will take a look and adjust the spam detector to prevent more problems. Sorry for the inconvenience.