A TXT record that lists which mail servers are authorized to send email on behalf of your domain.
This specific query refers to a common issue where email addresses (Gmail, Yahoo, Hotmail, AOL) are formatted in a
Name: @ Value: v=spf1 mx include:spf.google.com include:spf.protection.outlook.com include:_spf.verizon.net ?all
If you are still experiencing these issues, you generally need to:
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