Address OS
Mailboxes, aliases, catch-all, plus-addressing, send-as permissions, and startup templates.
Custom-domain email for founders
Founder Mail OS
Run every startup email address, alias, catch-all route, reply identity, and deliverability check without managing a mailserver or paying for a workspace seat for every function.
Cloudflare inbound R2 mail vault SES outbound
The wedge
Business email should not become founder infrastructure homework.
Create founder@, hello@, support@, billing@, investors@, and catch-all without buying a full workspace seat for every address.
See exactly which address received a message, where it routed, and whether it should become an alias, stay quarantined, or be blocked.
Reply from the identity they emailed, with raw inbound and outbound mail stored in your R2-backed vault.
Not another Gmail clone.
Founder Mail OS is the operating layer for domain setup, address routing, inbox context, reply identity, and mail health.
Product pillars
One place for the messy parts of startup email.
Routing OS
Direct mailbox, alias, catch-all, blocked recipient, and founder-specific inbox views.
Deliverability OS
Cloudflare inbound, SES outbound, DNS guidance, provider readiness, and fix-next checks.
Mail Vault
Raw inbound and outbound MIME in Cloudflare R2, plus portable route and message exports.
MVP flow
From hello@ to reply, without a VPS mail stack.
01Cloudflare receives mail
02Worker stores raw .eml in R2
03Backend parses and routes
04Founder replies through SES
Lean by design
Keep the infrastructure bill boring.
The product uses Cloudflare Email Routing, Cloudflare R2, and Amazon SES so early teams avoid VPS mail hosting, port 25 problems, and heavyweight per-seat workspace pricing.