Separating transactional and marketing email onto different subdomains provides reputation isolation.
Recommended structure:
trans.example.com→ Order confirmations, password resetsnews.example.com→ Marketing newslettersexample.com(parent) → Corporate communications only
Each subdomain needs its own SPF, DKIM, and DMARC configuration.
⚠️ Note: Reputation can still "leak" between subdomains sharing a parent domain, but isolation significantly reduces cross-contamination.
Sign in to keep track of what you have read.