Using subdomains helps isolate reputation and organize authentication. Learn best practices for subdomain-based sending.
Subdomain delegation is when a company uses subdomains to separate email types, like marketing.example.com for campaigns and transactional.example.com for receipts.
This improves operational clarity and can isolate reputation issues. It also simplifies DNS management for SPF, DKIM, and DMARC when multiple systems send mail.
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