SPF problem on valid domain name

Brass Contributor



We are starting to have problems (Received-SPF fail) since a few days on some email, here a example from a valid email that was cut by O365 and put in the quarantine.

This email was generated by us via Adobe electronic signature and the error is:


Received-SPF: Fail (protection.outlook.com: domain of mail.na4.adobesign.com

does not designate as permitted sender)


after digging a bit, I realise that this IP is an IP from Microsoft, it's a bit strange that O365 is blocking an email from one of it's own IP address ?


I'm not sure where to start to investigate this problem


any advise will be helpfull


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