General knowledge about how organization email works, independent of any one setup order. Business Bootstrap links here from its curated email path; the pages live here so every product and org doc can share one copy.
Explanation
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Human vs product messaging — why personal SMTP / Gmail send-as differs from app transactional and marketing stacks
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Cloudflare Email Routing limits — receive/forward only, not a mailbox or SMTP service
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DMARC policy path — why
p=nonefirst, how to reach enforcement