ThoughtContagion

KnowBe4:
  ATP Bypass by Header: Bypassing Safe Links and Safe Attachments by header values allows attackers to modify the header of their emails and bypass security measures. - https://support.knowbe4.com/hc/en-us/articles/115004326408-How-to-Bypass-Safe-Link-Attachment-Processing-of-ATP)
  Bypass Spam Filtering by Domain: Bypassing Spam filtering by domain allows attackers to spoof external domains and IP addresses to bypass security measures. - https://support.knowbe4.com/hc/en-us/articles/360010283614
  Bypass Spam Filtering by Header:  Bypassing Spam filtering by header values allows attackers to modify the header of their emails and bypass security measures. - https://support.knowbe4.com/hc/en-us/articles/212723707
  Adding KnowBe4 to your SPF Records: While not inherently dangerous, attackers can query a domain's DNS records to enumerate if they are KnowBe4 customers. - https://support.knowbe4.com/hc/en-us/articles/115003254328
  Edit Account Settings: By changing the default header value in KnowBe4 ac