<b>Why your password resets shouldn't share a domain with promos</b>

<b>Why your password resets shouldn't share a domain with promos</b>
The sender-architecture reads that prevent cross-contamination.

🚀 Deliverability
— Postmark on separating streams — one bad promo campaign shouldn't drag your receipts into spam; subdomain separation is the fix.
— Mailgun subdomain strategy guide — the 'mg.yourdomain' vs 'news.yourdomain' setup, with DNS specifics.
— DMARC alignment notes for subdomains — how to authenticate sends across subdomains without breaking policy.
— Reputation-isolation case studies — real examples of transactional deliverability saved by the split.

These earned the slot because the mistake is invisible until a marketing send tanks your login emails — then it's an emergency.

Saved you ~2 hours of a fire you can prevent in an afternoon.