Use when a domain's email is landing in spam, or you see SPF PermError / "too many DNS lookups", DMARC stuck at p=none, a "550 5.7.515" or "550 5.7.1" rejection, DKIM failures, or a domain that might be blacklisted. Diagnoses SPF, DMARC, DKIM, MX, DNS, blacklist and domain/SSL expiry via the DNS Doc
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