Office 365 Spoofing

We use Office 365 for our email. We use a program that sends out emails on our behalf to us and our customers. When they are sent back to us, they have the following, '[This sender failed our fraud detection checks and may not be who they appear to be. Learn about spoofing at]. How do we allow this, so we don't receive the message?
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Adam BrownSr Solutions ArchitectCommented:
Configure SPF records that include Office 365's mail servers and the mail servers used to send messages on your behalf. SPF records take a while to explain, so look at your DNS settings and modify the TXT record that starts with "V=spf1" and add "ip4:<ip of additional server>" before the -all at the end of the record.

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Todd NelsonSystems EngineerCommented:
Typically, the TXT record for SPF will need to be configured for your 3rd party senders.  They will traditionally need to add an "include:..." statement to prevent NDRs for those recipients who check for valid senders.

Contact your vendor for your requirements.
Todd NelsonSystems EngineerCommented:
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