SuspectScore in Email Headers

Question

I've Googled quite a bit and cannot find a definition to tell me what this means or how I can fix it.

I'm setting up some follow up emails, using mailgun.org as my SMTP provider and in the header I'm receiving this:

X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 suspectscore=99 phishscore=0 adultscore=0 bulkscore=100 classifier=spam adjust=0 reason=mlx scancount=1 engine=7.0.1-1308280000 definitions=main-1310230044

All of that looks fine with the exception of suspectscore=99 I can't find a definition for this, but it can't be a good thing to be a 99% suspect.

Anyone can enlighten me or point me to an accurate definition of suspectscore?

Answer 1

That's a header specific to a vendor product: Proofpoint. You'll have to work with them to understand what's going on.