Before that, a little about SPF.
It can be used to look up the error on the web and troubleshoot the issue.
This then results in the email not being delivered.
The email can fail the SPF check due to several different reasons, which have been discussed below.
Anything else would make it invalid, and for the mail servers, the SPF record would not exist.
To learn how to correctly configure an SPF record, refer to ourdetailed guide.
This means that a maximum of 10 SPF DNS lookup queries are allowed per SPF record.
This rule has been implemented to tackle DOS attacks.
If an SPF record lookup exceeds this limit, you might see a bounce-back email stating SPF Check Failed.
Therefore, you should probably ensure that your SPF record is configured correctly and within the limit.
To begin, check out whether the current configuration is right or not.
For that purpose, it’s possible for you to use ourEmail Security & Deliverability Checker.
If it shows that the SPF record is not configured correctly, then proceed to make the necessary changes.
Therefore, verify the DNS MX record is pointing toward the correct mail exchange server.
Email service providers have established particular criteria for the alignment of your sending sources.
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source: www.itechtics.com
