Sender failed fraud detection checks

I don’t know, but at least Contact Form 7 has nothing to do with it.

Dear Takayuki,
I have the same issue described above. However Fast Secure contact form plugin does not create this issue. Only Contact Form 7 plugin does. I am using Microsoft Office 365 for emails.
If you find a fix, please let us know.
Regards,
Prageeth.

This is what fixed my issue;
Sign into Exchange admin center (https://outlook.office365.com/ecp) with your Office 365 admin account. In Mail Flow, click + to Create a new rule…, select More options. Set Apply this rule if… – the sender is this person and select the account which sends the emails. Set Do the following… – Modify the message properties – Set the Spam Confidence Level to bypass spam filtering and click Save at last.

• This reply was modified 6 years, 10 months ago by Prageeth83.

I am having the same problem and the information above regarding creating a new rule did not solve the issue.

Still getting email with this at the top:

[This sender failed our fraud detection checks and may not be who they appear to be. Learn about spoofing at https://aka.ms/LearnAboutSpoofing%5D

Any help? GoDaddy is at a loss.