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![SOLVED] Office 365 How to reject incoming emails that has invalid SPF record](https://content.spiceworksstatic.com/service.community/p/post_images/0000331082/5bc75918/attached_image/Invalid_SPF_Record_2.png "SOLVED] Office 365 How to reject incoming emails that has invalid SPF record")
SOLVED] Office 365 How to reject incoming emails that has invalid SPF record
Demystifying DMARC: A guide to preventing email spoofing - seanthegeek.net
