Error: SPF authentication failed

What's Causing This Error

The SPF authentication failure error may occur due to multiple reasons, such as:

• Unable to resolve the domain name within the DNS.
• SPF record was not present for the domain.
• SPF record contains invalid syntax.
• The IP address is not listed in the SPF record.

Solution - Here's How To Resolve It

Follow these steps to resolve this issue:

1. Ensure that the domain name is resolvable.
2. Ensure that the domain contains valid SPF records.
3. Ensure that the SPF record does not have any invalid syntax.
4. Ensure that the SPF record includes a valid IP address.