Lindsay Haisley writes:

MAIL From:<[EMAIL PROTECTED]> SIZE=3764
 517 SPF fail coolcart.com: Maximum of 20 nested SPF queries exceeded.
 QUIT
--- End Transcript ---

Why are we getting "nested SPF queries"?

Because coolcart.com are morons.

coolcart.com's SPF record:

coolcart.com.           86362   IN      TXT     "v=spf1 mx include:coolcart4.com 
-all"

and coolcart4.com's SPF record:

coolcart4.com.          86345   IN      TXT     "v=spf1 mx include:coolcart.com 
-all"

Even if you do not really know much about SPF, it's quite clear that they have an infinite loop in their SPF specification.

Should I turn off SPF for the envelope sender address? Or should I leave it on and indicate that a "fail" result is acceptable?

If someone's SPF record is broken, and you desperately need their mail, you'll just have to turn off SPF filtering.

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