Custom Domain Email.Affordable & Private.
Custom domain email engineered with a modern chat-like UI. Communicate formally with clients and teams like you're in a clean messenger—without nested quote chains or clunky composers.
Chat-Like Formal Email UI
Read and reply to threads like a sleek messenger. Toggle between Chat & List view, ditch quote clutter, and send instant inline replies.
1-Click DNS Presets
Automated SPF, DKIM 2048-bit, and DMARC presets verified in 60s for Cloudflare, Namecheap, GoDaddy, and Route53.
Flat Rate • Zero Ad Mining
Flat ₹49 / mo for your entire custom domain with unlimited mailboxes. End-to-end encrypted with zero AI scraping.
Email with the speed of chat.Professionalism without the clutter.
Traditional email buries business communication under nested > > > quotes and bloated signature blocks. Kosh formats your inbox like a modern formal messenger—so you email clients with zero friction.
Elena Rostova
elena@apexventures.io
Thanks Elena! Delighted to hear. I have countersigned the execution draft and attached the finalized agreement below for your closing binders.
Replies deliver as standard RFC email to their inbox, while you enjoy the speed of chat.
Dual View Switching
Toggle effortlessly between conversational Chat Mode for fast back-and-forth exchanges and classic List Mode for deep email review.
Automated Quote & Signature Stripping
Kosh's intelligent text cleaner automatically isolates the actual message from legal footers, company signatures, and nested quote headers.
Instant Bottom Reply Bar
No popup compose windows or multi-step reply dialogs. Just type your formal response, drop attachments, and send with one keystroke.
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 simple 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
Formal Chat UI & Team Workspaces
Experience email with the speed and elegance of formal chat. Clean threads, instant reply bars, and seamless List vs Chat mode switching.
- Dual Chat & List viewing modes
- Zero signature or quote clutter
- Instant inline reply composer
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.
Chat-Like Formal Email UI
Say goodbye to 1990s email composing. Kosh formats threads like a sleek messenger, stripping quote noise and allowing you to email clients with the fluidity of chat.
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.
Chat-Like Formal Email UI
Say goodbye to 1990s email composing. Kosh formats threads like a sleek messenger, stripping quote noise and allowing you to email clients with the fluidity of chat.
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.