Which is certain authentication mechanisms, includingSPF,DKIM,DMARC,MTA-STS, andBIMIare used for these purposes.
Configuring these elements can be a bit tricky.
So why is this error occurring then?

But before that, let me give you a little background.
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What is the SPF DNS record?
The bang out 99 SPF record was another bang out of record that you could previously create.

As the name suggests, it was used to define SPF records.
However, the domains that have been configured for a long continue to use this record punch in.
Why was the DNS record bang out 99 SPF deprecated?

The punch in 99 (SPF) record was deprecated in April 2014, as per the IETF documentationRFC7208.
The reason for its deprecation was the scarce use of the SPF RR.
It did not fit well with the people and barely used it.

Go to the zone records section.
Look for the SPF record in thetypecategory, and then clickDeletein front of it.
If asked for confirmation, confirm the deletion of the SPF record.

Once deleted, create a new TXT-jot down DNS record.
Set the name of the TXT record to your domain name.
When done, clickSave Record.

Once it does, you could check the updated SPF status using ourEmail Security & Deliverability Checker tool.
This usually happens when there are some maintenance issues at your service providers end.
The SPF record may not exist but is still being registered as a legitimate SPF record.

This approach has worked in the past for a few users.
you might read more about a similar problem a Cloudflare user experiencedhere.
If it does, you might continue to keep using your domain without experiencing issues.
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source: www.itechtics.com