Private Custom Domain EmailWithout Per-Seat Pricing
Bring your domain communication to life with dedicated inboxes and zero seat markups. No per-user taxes. No tracking. No waiting.
Managing email infrastructure wasn't supposed to be your second job
Between shipping features, closing clients, and scaling operations, email deliverability fires keep pulling you away from growth. If any of this sounds familiar, you're not alone:
DNS & Deliverability Drain
SPF, DKIM, and MX records fail silently and critical business emails land in spam instead of customer inboxes.
Per-Seat Pricing Bloat
Paying $10–$30/user every month just for shared inbox aliases, support bots, and internal handles that should be free.
Privacy You Keep Compromising
Big tech platforms scanning inbox contents, analyzing threads, and mining domain communications for ad targeting.
Get started with Kosh in three easy steps
Connect Custom Domain or Claim Free Handle
Link your custom business domain with 1-click automated DNS records (SPF, DKIM, DMARC), or reserve a memorable @kosh handle in under 60 seconds.
- Instant 1-click DNS verification
- Custom domain or @kosh handle
- Zero propagation wait time
Team Inboxes & Smart Privacy Aliases
Configure shared team inboxes, smart catch-all routing, and disposable privacy aliases to protect your personal identity while collaborating.
- Shared inboxes & permissions
- Unlimited privacy aliases
- Catch-all & spam filters
Encrypted Delivery and Real-Time Sync
Send and receive email with 99.9% inbox placement, end-to-end encrypted storage, zero ad profiling, and real-time syncing across web and mobile.
- Pristine IP inbox deliverability
- Zero tracking or ad profiling
- Web & Android cross-platform sync
What we help you build with your custom email stack
Everything you need to launch, scale, and secure professional email across all your domains without legacy enterprise headaches.
Custom Domain Email
Connect any domain in under 60 seconds with automated DNS presets, dedicated 2048-bit DKIM keys, SPF, and DMARC policies. Professional email without the setup headache.
Zero Per-Seat Pricing Bloat
Stop paying $10–$30/user every month just for shared inboxes, bot handles, and aliases. Scale your team freely with fair, transparent pooled workspace pricing.
Zero Inbox Mining
Your communications are never scanned, analyzed, or used to train AI models. Protected with TLS 1.3 in transit and encrypted with AES-256 at rest.
Flawless Deliverability
Reputation-monitored IP pools, DNS spoof prevention, and smart quarantine filtering ensure your critical emails consistently land in the primary inbox.
Unlimited Aliases & Routing
Create unlimited handles for sales, support, and billing. Enable smart catch-all routing so you never miss a misaddressed email again.
Custom Domain Email
Connect any domain in under 60 seconds with automated DNS presets, dedicated 2048-bit DKIM keys, SPF, and DMARC policies. Professional email without the setup headache.
Zero Per-Seat Pricing Bloat
Stop paying $10–$30/user every month just for shared inboxes, bot handles, and aliases. Scale your team freely with fair, transparent pooled workspace pricing.
Zero Inbox Mining
Your communications are never scanned, analyzed, or used to train AI models. Protected with TLS 1.3 in transit and encrypted with AES-256 at rest.
Flawless Deliverability
Reputation-monitored IP pools, DNS spoof prevention, and smart quarantine filtering ensure your critical emails consistently land in the primary inbox.
Unlimited Aliases & Routing
Create unlimited handles for sales, support, and billing. Enable smart catch-all routing so you never miss a misaddressed email again.
Today – we power thousands of mailboxes in 100+ countries.
Questions?
We're here to help
Get custom domain email, team inboxes, and seamless integration. No fragmentation, no vendor lock-in.