Your email data
stays in Bharat.

Private email on S3-owned servers in secured Indian facilities. Indian-owned, operated entirely from Bharat. No third-party platforms, no backdoors, no surprises.

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S3 SecureMail — secure business email hosted in India, SPF DKIM DMARC encrypted
A note on compliance
S3 SecureMail is built for compliance-sensitive industries. Our infrastructure is designed to support your compliance posture — but achieving compliance depends on your obligations and configuration. We give you the infrastructure and guidance, not a compliance certificate. Speak to your legal counsel to confirm the right setup.

Secure email infrastructure
you can actually trust.

We don't resell someone else's email platform. Every component runs on S3-owned servers, configured and maintained by our team.

We own the full email stack

Every layer runs on infrastructure we manage directly. No third-party company holds your email data. No sub-processors you don't know about.

Global technologies, Bharat control

Battle-tested open-source technologies used by global banks and governments — controlled, configured, and operated exclusively by our team in Bharat.

Secure email: no backdoors, no telemetry.

Open-source means fully auditable. We review every component before deployment, harden it, and disable all telemetry before it handles your data.

Indian-owned. India-operated.

S3 is incorporated in India, privately held, and wholly Indian-owned. Your email is stored on S3-owned servers in secured Indian co-location facilities — not replicated internationally.
// HOW YOUR SECURE EMAIL IS HANDLED IN INDIA
01
Sender connects to our gateway
Email arrives at our dedicated gateway — an S3-owned server in an Indian facility. Sender authentication validated at entry. Malicious sources rejected before content is processed.
02
Multi-layer threat analysis
Spam scoring, malware scanning, phishing detection. All on our servers using auditable open-source engines. No content sent to any external scanning service.
03
Content policy enforcement (Compliance tier)
Outbound messages checked against your content policy before delivery — keyword rules, attachment limits, sensitive data patterns. Your rules, applied by us.
04
Delivered to an encrypted mailbox
Per-user encryption keys on mailboxes, plus block-level volume encryption. Unreadable without the user's credentials, even with physical server access.
05
Archived (Business and Compliance)
Tamper-evident copy of every message in a separate archive store. End users cannot delete. Available for compliance review and eDiscovery.
06
Access via any standard client
Outlook, Apple Mail, Thunderbird, any mobile app. Push email auto-configures on phones. No proprietary app. No vendor lock-in.

Simple, transparent pricing.

All tiers include India-hosted infrastructure managed entirely by the S3 team. Migration from Google Workspace, Microsoft 365, or Zoho included on qualifying accounts.

STARTER
₹349
/mailbox/month
₹4,188/mailbox billed annually
+ 18% GST
MINIMUM 5 MAILBOXES

+Custom domain email
+S3-owned servers in India
+SPF, DKIM, DMARC authentication
+Spam and malware filtering
+Webmail + IMAP / SMTP
+15 GB pooled storage per user
+Email support 9×5
Encryption at rest
Mobile push email
Email archiving
COMPLIANCE
₹1,299
/mailbox/month
₹15,588/mailbox billed annually
+ 18% GST
MINIMUM 15 MAILBOXES

+Everything in Business
+Dedicated single-tenant server
+Unlimited email archiving
+Outbound content policy (DLP)
+eDiscovery — search and export
+Per-organisation content ruleset
+99.9% uptime SLA with credits
+24×7 priority support
+Quarterly written compliance report
Add-ons (all + 18% GST): Extra Storage ₹200/month per 100 GB block | Migration from Google / M365 / Zoho ₹15,000 one-time | Advanced threat gateway ₹8,000/month | Compliance audit report ₹25,000/quarter
Comparison of India-hosted secure email versus Google Workspace and Microsoft 365 for compliance

S3 SecureMail vs
shared cloud email.

FeatureS3 SecureMailGoogle WorkspaceMicrosoft 365
Data hosted in IndiaYes — alwaysPaid add-onEnterprise only
Subject to US CLOUD ActNoYes — US companyYes — US company
Dedicated single-tenant serverYes (Compliance tier)No — shared infraNo — shared infra
Encryption at rest, per-user keysYesShared keys (Google)Shared keys (Microsoft)
Outbound DLP / content rulesYes — per-client rulesetBusiness+ onlyComplex to configure
Archiving + eDiscovery includedYesVault — paid add-onExchange Archive — add-on
No third-party sub-processorsS3 team onlyMany globallyMany globally
Indian-owned operatorYes — Delhi NCRNoNo
Cost for 50 mailboxes₹17,450/month (Starter)₹9,000–36,500/month₹12,000–40,000/month

50 × ₹349 = ₹17,450/month. Competitor pricing indicative.

Is S3 SecureMail
up right now?

Frequently asked questions about S3 SecureMail India-hosted business email service

Frequently asked
questions.

Google and Microsoft are US companies. Their servers, even when located in India, are subject to the US CLOUD Act — meaning the US government can compel them to hand over your data.

S3 is incorporated in India, Indian-owned, and operated entirely from Delhi NCR. Your email is on S3-owned servers in secured Indian co-location facilities, subject exclusively to Indian law. No foreign government has a legal mechanism to compel access through S3.

Each user gets 15 GB as their allocation. "Pooled" means the total across your organisation is shared — a team of 10 has a 150 GB pool. Heavy users can draw more, light users less, as long as the total stays within the pool.

You can add storage in 100 GB blocks at ₹200/month per block (₹2,400/year per block), plus 18% GST. Add-on storage is available on all tiers.

Yes. You keep your domain (e.g. yourfirm.com). We configure your DNS records (MX, SPF, DKIM, DMARC) so email routes to our servers. Your email addresses stay exactly the same — only the underlying infrastructure changes.

We handle the entire migration. It typically takes 42–48 hours and is zero-downtime — your team continues sending and receiving email throughout. We migrate historical mail, calendar, and contacts from Google Workspace, Microsoft 365, or Zoho.

The DNS cutover is scheduled at a low-traffic time and monitored to completion. Most teams don't notice the transition at all.

Any standard client — Outlook, Apple Mail, Thunderbird, or the webmail interface. On mobile: iPhone Mail, Gmail app, Outlook mobile, or any Android email app. Business and Compliance tier clients get push email and calendar sync configured automatically via autodiscover. Users don't need to enter server settings manually.

A policy layer that checks every outbound email before delivery. Examples: block emails containing Aadhaar numbers sent to external domains, flag large attachments to certain recipients, or ensure client-classified documents never leave your organisation. You define the rules — we apply them.

Yes. 2FA is supported via TOTP apps (Google Authenticator, Authy, etc.) and can be enforced org-wide on Business and Compliance tiers. Mandatory enforcement is available on request for Compliance tier clients.

We export your complete mailbox data in standard MBOX format within 15 business days, importable by any provider. We help with the outgoing migration. Your data is not held hostage — it's yours. The annual contract covers the billing commitment — your data is always yours. Give us 90 days notice before your renewal date if you do not wish to renew, and we will handle the outgoing migration at no charge.

All mailbox data is backed up daily to a separate storage location within India. Business and Compliance tier clients have off-site replication available. Recovery point objective (RPO): 24 hours for Starter, 6 hours for Business/Compliance. Recovery time objective (RTO): 4 hours for Business and Compliance.

All tiers are billed annually in advance. Pricing shown is per mailbox per month — the annual invoice is 12 months at that rate. This is standard practice in India and keeps administration simple for both sides.

There is no month-to-month option — the minimum commitment is one year for all tiers. If you need to grow your mailbox count during the year, incremental mailboxes are added at the same per-mailbox rate and prorated to your next annual renewal date.

Pricing is fixed for the contracted year. We notify you of any changes at least 90 days before your renewal date.

Free compliance snapshot.

15 minutes. We review your email setup and identify every data residency gap. Written findings, no pitch.

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