title: issue with anti-spam exchange office365
body: <p>I have an issue with anti-spam of the exchange microsoft
  So the problem is we have an application in our company that send automatic resiliation mail to our clients, no problem with oubound mail, but when our clients (using their personal email to answer like outlook, gmail, yahoo...)
  almost all the responses are blocked by the anti-spam, we already checked our strategies and almost everything is by default.
  but we do use one mail flow rule: when a client response to the automatic mail, the mail flow rule add one recipient to the response, so the response mail is duplicated toward two recipients: the automatic mail and our private intern mail
  worked fine for a while but now is lagging
  so for the original recipient everything is ok, almost no spam, but for the added recipient (our private intern mail) almost everything is going into spam.
  We already check all the headers in differents responses and after investigation we had found in the header X-Forefront-Antispam-Report, the value SFS are differents from the original response we have 3 more filter rules of the microsoft anti-spam that are applied to the duplicate mail but we don't know what the meaning of the rules: 58800400005, 84300400001, 22186003
  I'm out of ideas if someone know how to troubleshoot more spam issue in exchange microsoft, can he give me a tip, that will be very kind :)
  many thanks,
  Best regards,</p>