What does validating mx record mean

" data-medium-file="https://i2com/pressable.com/wp-content/uploads/2014/12/a_record.png? fit=300,113&ssl=1" data-large-file="https://i2com/pressable.com/wp-content/uploads/2014/12/a_record.png? fit=690,261&ssl=1" class="size-large wp-image-8621" src="https://i1com/pressable.com/wp-content/uploads/2014/12/a_record-1024x387.png? resize=690,260" alt="A Record listing in the Go Daddy DNS Management Panel." srcset="https://i2com/pressable.com/wp-content/uploads/2014/12/a_record.png?

resize=1024,387&ssl=1 1024w, https://i2com/pressable.com/wp-content/uploads/2014/12/a_record.png? resize=300,113&ssl=1 300w, https://i2com/pressable.com/wp-content/uploads/2014/12/a_record.png? resize=720,272&ssl=1 720w, https://i2com/pressable.com/wp-content/uploads/2014/12/a_record.png? w=1332&ssl=1 1332w" sizes="(max-width: 690px) 100vw, 690px" data-recalc-dims="1" / The screenshot above is a sample of A Record listings of different types.

The following paragraph details the meaning and usage of each of these syntax.

Without one, your email has a greater chance of being marked as Spam. If no mechanism or modifier matches, the default result is "Neutral".If a domain has no SPF record at all, the result is "None".Receiving this warning means you either don’t have a SPF record or it is invalid.Note: Using TXT records to contain SPF information was designed as a transitional mechanism as some servers and clients did not support the new SPF record type.

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