User ManualEmail Discussion Group User Guide TroubleshootingHow to fix Spoofing Errors by updating your DNS

How to fix Spoofing Errors by updating your DNS

Microsoft / Office365 / Outlook / Live / Hotmail

will sometimes put warning messages on emails from your mailing list.

This sender failed our fraud detection checks and may not be who they appear to be. Learn about spoofing

This message is placed at the top of the email.

It does not block the email, but it confuses the receipent.

Mailing list mail is From the person who sent the email, while it's the servers that deliver the message.

The mismatch is what causes Microsoft to create the warning message.

You can signal to Microsoft that is allowed to send emails on your behalf

We use the SPF records in the Domain Name Server (DNS)

You need to have access to update your DNS SPF records

If you do, you simply need to insert one extra part into your DNS SPF setting.

You want to update the TXT record.  The TXT record contains the SPF settings.

This will tell Microsoft, and other ISP's, to look up the SPF records at and include our IP addresses as valid email senders.

So you want to add to your existing SPF records

For example, before and after

v=spf1 a ip4:  -all

v=spf1 a ip4: -all

Tools to check that you have your SPF records set up correctly.

Online Tool For Reading Office365 Message Headers


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