The article describes the proper steps to whitelist a sender in order to bypass Anti-spoofing mechanisms such as : SPF / DMARC or If you would like to Bypass Signature / Heuristics , and Newsletter detection.
Email Security.cloud
In order to Bypass the Anti-spoofing ( SPF / DMARC ) or Signature / Heuristics , and Newsletter detection :
1 - Go to the Client net Portal under : Dashboard > Services > Anti-Spam and select Approved senders Tab.
2 - Click Add Entry Tab and type the domain/Email/ IP to bypass and You will have a few choices depending on your needs, the selected service will be bypassed.