Email infrastructure your business can build on.
sigmamail.space unifies encrypted business mailboxes, a 99.99 %-uptime sending relay and AI-assisted triage in a single platform — so every message your company sends lands, on time, in the inbox.
No credit card required · Full migration in under 10 minutes · Cancel anytime
- SOC 2 Type II
- ISO 27001
- GDPR
- HIPAA BAA
- DMARC p=reject
Series B term sheet — countersigned
nordwind.capital@verified · SPF ✓ DKIM ✓ DMARC ✓
Median hand-off
41 ms
Inbox placement
99.2 %
Threats blocked (24h)
1,408
Trusted by 12,000+ teams — from seed-stage to the Fortune 500
0.00 %
Platform uptime
Measured across 14 regions, trailing 12 months
0 ms
Median hand-off
API accept to first upstream MX delivery attempt
0.00B
Messages / month
Transactional, marketing and human mail combined
0.0 %
Inbox placement
Average across all authenticated customer domains
One platform for every message your company sends
Most teams stitch together a mail host, a sending API, a security gateway and a helpdesk. Sigmamail replaces all four — with one identity model, one audit log and one bill.
AI triage that routes before you read
Every inbound message is classified, summarised and routed to the right queue in under 300 ms — with the reasoning shown, never hidden.
A relay API your engineers will actually like
Idempotent sends, typed SDKs for six languages, webhooks for every lifecycle event, and SMTP that behaves exactly like the docs say.
await sigma.relay.send({
from: "billing@acme.com",
to: "cfo@northwind.io",
template: "invoice_paid",
idempotencyKey: inv.id,
});Shared inboxes with real accountability
Assignment, SLAs, internal notes and collision detection — so nothing sits unanswered in a role account for three days.
Delivered from the closest edge
Anycast ingress across 14 regions with automatic failover and per-region data residency controls.
Encrypted end to end, keys stay yours
Per-message envelope encryption, bring-your-own-key via HSM, and DLP policies that block exfiltration before it leaves.
- Unlimited aliases & catch-all domains
- Legal hold and 7-year archiving
- SCIM, SAML SSO & SCIM deprovisioning
- Full audit trail, exportable via API
Live on sigmamail in under ten minutes
Migration is the reason teams stay on infrastructure they hate. We removed the reason.
Point your domain
Paste your domain and we generate every DNS record — MX, SPF, DKIM and a strict DMARC policy. One-click apply on Cloudflare, Route 53 and Vercel.
Verifying 0/4 records…
Migrate every mailbox
IMAP, Google Workspace and Microsoft 365 imports run in parallel with full folder structure, flags and threading preserved. Old mail keeps flowing until you cut over.
Warm up, then enforce
We ramp send volume against your reputation curve and escalate DMARC from none to reject only when alignment hits 100 % — no self-inflicted outages.
Ship with confidence
Placement, bounce and complaint telemetry stream into one dashboard, with alerting to Slack, PagerDuty or your own webhook the moment a metric drifts.
Sent today
1.24M
Bounce rate
0.11%
Spam rate
0.02%
Open rate
48.6%
Security that holds up under procurement review
94 % of breaches still start in the inbox. Sigmamail treats mail as hostile input by default — and gives your security team the controls and evidence they are asked for every single quarter.
Zero-trust message handling
Every hop is mutually authenticated. Messages are envelope-encrypted at rest with per-tenant keys you can rotate or revoke on demand.
Impersonation defence that actually enforces
Lookalike-domain detection, display-name spoofing checks and automatic DMARC escalation — with a rollback path if alignment drops.
Data residency you choose per domain
Pin mailboxes to EU, UK, US or AU regions. Nothing replicates outside the boundary, including backups and search indices.
Evidence for your auditors, on tap
Immutable audit logs, legal hold, 7-year archiving and one-click evidence exports mapped to SOC 2 and ISO controls.
The spam folder is a revenue problem
A 9-point placement gap on 500,000 monthly sends is 45,000 conversations that never happened. We measure placement per domain, per mailbox provider, every hour.
Median inbox placement by stack
Q2 · n = 4.1M sendssigmamail.space
Authenticated domains, warmed
Legacy secure gateway
Typical enterprise stack
Generic SMTP provider
Shared IP pools
Self-hosted Postfix
Unmanaged reputation
Measured with seed-list panels across Gmail, Outlook, Yahoo and corporate Exchange. Methodology published in full — we would rather be audited than believed.
“We moved 1.2 M monthly sends over a weekend. Placement went from 88 % to 99 % and our reply rate went up by a third.”
Head of Growth · Lumenpay
Teams that stopped apologising for email
12,000+ companies run their mail on sigmamail.space — from four-person startups to regulated groups with 40,000 mailboxes.
We replaced a secure gateway, a helpdesk and two SMTP vendors with one contract. Procurement was the easiest part of the year.3 vendors → 1
The migration ran on a Saturday and nobody noticed on Monday. That is the highest compliment I can give an email platform.
Placement telemetry per mailbox provider changed how our growth team writes. We stopped guessing why Outlook hated us.+31% reply rate
We replaced a secure gateway, a helpdesk and two SMTP vendors with one contract. Procurement was the easiest part of the year.3 vendors → 1
The migration ran on a Saturday and nobody noticed on Monday. That is the highest compliment I can give an email platform.
Placement telemetry per mailbox provider changed how our growth team writes. We stopped guessing why Outlook hated us.+31% reply rate
4.9/5
G2 average · 1,240 reviews
< 4 min
Median first support response
98.4 %
Annual net revenue retention
0
Reportable breaches since 2019
Straightforward pricing, no seat-count games
Every plan includes the full security stack. We do not charge extra for encryption, SSO or audit logs — those are not upsells.
Save 20 % with annual billing
Team
For startups that just need email to work.
billed annually · $84/yr
Start free trial- Up to 25 mailboxes
- 50 GB storage per mailbox
- Unlimited aliases & domains
- Shared inboxes with assignment
- SPF, DKIM & DMARC automation
- Email + chat support
Billed per active mailbox. No setup fee.
Business
For teams where deliverability is revenue.
billed annually · $180/yr
Start free trial- Everything in Team, plus
- Unlimited mailboxes · 100 GB each
- Relay API — 500k sends / month
- Sigma AI triage & summaries
- Placement telemetry per provider
- SAML SSO, SCIM & audit logs
- 99.99 % uptime SLA with credits
- Priority support · 4 min median
Most companies land here. Switch plans any time.
- Everything in Business, plus
- Per-domain data residency
- Bring-your-own-key via HSM
- Legal hold & 7-year archiving
- Dedicated IP pools & subnets
- Named CSM + migration engineer
- Custom DPA, MSA and security review
Volume pricing from 500 mailboxes upward.
Non-profit, education and open-source? We discount 50 % across every plan, permanently.
Wired into the tools you already run
160+ native connectors, a typed webhook for every event, and an outbound API that does not require a middleware layer to be useful.
The questions procurement asks
Everything below is answered the same way in our contract. If something is missing, our solutions engineers reply in minutes, not business days.
Still evaluating?
Get a 30-minute technical walkthrough with an engineer who has migrated your exact stack before.
Book a technical sessionFor most companies, under ten minutes of hands-on work. You point your domain, we generate every DNS record, and mailbox imports run in the background — IMAP, Google Workspace and Microsoft 365 all supported. Mail keeps flowing to your old provider until you cut over, so there is no window where messages can be lost.
Stop losing revenue to the spam folder
Move your company to sigmamail.space this week. A migration engineer runs the cutover with you — at no cost, on any plan.
- 14-day trial, full platform
- Migration engineer included
- No credit card required