What Is a Subdomain and Why Do I Need One? | Pair Networks Blog

: For high-volume senders (over 5,000 emails/month), separating streams is considered a best practice to maintain business continuity. User Reviews & Community Feedback

: Using a subdomain like marketing.yourdomain.com ensures that if a promotional campaign is flagged as spam, your root domain (and critical corporate emails) remains protected.

A subdomain, on the other hand, is free to create (when hosted under your main domain) and shares many of your existing resources. Pair Networks Are Subdomains Bad for SEO? | SEO FAQ - Fire&Spark