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Correct mail configuration is especially important if you own a "biz" domain, to avoid having your email misinterpreted or misclassified as spam.

Sender Policy Framework

SPF is described in RFC 7208 and implemented as a DNS TXT record.

example.biz.            86400   IN      TXT     "v=spf1 ..."

The version was never updated from 1.

DomainKeys Identified Mail


Domain-based Message Authentication, Reporting, and Conformance