EnterpriseHacker Noonabout 9 hours ago
Mail Server Build Centers on Four DNS Records
18 min read
Self-hosting email requires mastering four DNS records: PTR, SPF, DKIM, and DMARC. The PTR record must match the server hostname and HELO greeting. SPF goes on the root domain, not the mail subdomain. DKIM uses a selector record. These records convince Gmail's spam filter.
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