In this post, we are going to discuss what this oops message means and how to fix it.
The issue notification will also include your domain name and an IP address.
Moreover, you may see different variations of the fault signal.

So does that mean something different?
For that, we must first develop a basic understanding of SPF.
It is stored as a plain-text record on the DNS for your domain.

SPF softfail means that your SPF policy is configured as softfail.
One such qualifier is ~ (tilde), which represents softfail.
When the SPF policy is set to softfail, the mail server flags the email and lets it through.

The email would then likely end up in the spam/junk folder.
Learn qualifiers and mechanisms.
Note:You may also come across errors starting with 550 SPF Hardfail.

This is when the email sender receives a bounce-back email, and the error appears in the NDRs header.
Moreover, the initial email sent is also not delivered to the recipient.
For a hardfail SPF policy, the qualifier is used.

But before that, you should probably confirm that it is the only reason.
Open theEmail Security & Deliverability Checker tool.
input your domain name and clickAnalyze.

Here is adetailed post on SPF and how to configure it.
Edit the SPF record to include the IP address mentioned in the error in the email header.
This should resolve indirect mailflows and SPF authentication errors.
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source: www.itechtics.com