Best of the inbox: mixing your mail streams

Best of the inbox: mixing your mail streams
Framing: sending promos, transactional, and cold outreach from one domain lets the riskiest stream drag down the safest. Picks on isolation:

🚀 Deliverability
— Subdomain strategy by stream — earned its spot for the clean split: transactional on one subdomain, marketing on another, cold never near either.
— Reputation-firewalling explainer — picked because a promo blocklist hit shouldn't kill your password-reset emails.

🧪 Tests
— Mixed-stream vs. isolated cohort data — worth it: isolated streams recovered from a bad send far faster.

📥 Swipe
— The subdomain DNS + DKIM checklist — included so each stream authenticates independently.

Through-line: don't let your loudest mail poison your most important.
Saved you ~85 minutes of tangled-reputation cleanup.