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There is a dedicated DNS SPF record which can be used for SPF record. However DNS TXT record may also be used for backwards compatibility.

If i CAN define SPF record - should i just delete the deprecated TXT record or leave it?

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up vote 2 down vote accepted

I chose to leave mine. It doesn't cost anything, and may continue to work.

Revisit this in a few years when more servers/clients have updated, and if you can, see who is asking for the TXT record perhaps.

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