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SPF Syntax Check

What you see when your domain has this problem
Invalid syntax found Details area Ignore
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More Information About Spf Syntax Check

Hostname returned invalid syntax for SPF record. We detected a problem with the syntax of your SPF record. This may cause email delivery issues to your message recipients.

A syntax error is the result of having one of more misconfigured mechanisms that do not meet guidelines in RFC 7208. This error will cause your SPF record to be read incorrectly and block legitimate email. 

Common SPF syntax errors are:

  • Mechanisms that perform DNS lookups (mx, a, ptr, exists, redirect, include) contain text rather than domains or hostnames
  • Mechanisms contain a numerical value, when they require a domain or hostname
  • Format of IP addresses for ip4 and ip6 mechanisms is incorrect 

Full list of SPF Mechanisms and examples

A hidden syntax error can make it very difficult to know why messages are being blocked, as SPF is used by all mail servers to autheticate the sender and the resulting block error may not specify that it is an SPF Record Syntax issue that is causing the problem.

SPF is the cornerstone of your email delivery strategy.

Are you confident your email is getting through?

MxToolbox is YOUR expert on email deliverability. MxDelivery Center analyzes your DMARC, DKIM and SPF to give you the insight you need to make email configuration changes and get your emails to your customer's.
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