Enterprise Email
Infrastructure.
Zero Complexity.
Transactional emails, marketing campaigns, email templates, contact management, SMTP relay, webhooks, and tracking — all from your own infrastructure. The open-source SendGrid alternative.
The complete email platform
Transactional email, marketing campaigns, contact management, analytics, and developer tools — in one platform.
SMTP Relay
Drop-in SMTP server with STARTTLS. Authenticate, send, done. Works with any language or framework.
REST API v2
Full HTTP API with template support, email validation, message queries, and statistics. Bearer token auth.
Email Templates
Create reusable templates with {{variable}} interpolation. Live preview editor with mobile/desktop toggle.
Marketing Campaigns
Build campaigns with contact lists, templates, and scheduling. Track opens, clicks, bounces in real-time.
Contact Lists
Manage subscriber lists with CSV import/export, manual add, and automatic status tracking (subscribed, bounced, unsubscribed).
Email Validation
Validate emails via API before sending. MX record checks, disposable domain detection, Gmail normalization.
Webhooks
Real-time delivery notifications for bounces, delays, opens, clicks, and delivery failures. HMAC signed.
Click & Open Tracking
Track opens via pixel and link clicks via URL rewriting. Full engagement analytics per message.
Stripe Billing
Built-in subscription management with usage meters, plan limits, and self-serve billing portal.
Audit Log
Complete audit trail of all actions. Track who created, modified, or deleted resources across your organization.
Team Roles
Owner, admin, member, and viewer roles. Control who can manage billing, servers, and domains.
Analytics & Statistics
30-day dashboards with incoming/outgoing/bounce charts. Per-server stats via API. Real-time throughput monitoring.
Up and running in three steps
Create your account
Sign up, name your organization, and you're in. Takes less than 60 seconds.
Configure your domain
Add your sending domain, set up DNS records with our guided wizard, and verify.
Start sending
Use SMTP credentials, REST API, or our campaign builder to send your first email.
Simple plans that scale with you
No per-email fees. No surprise charges. Cancel anytime.
Starter
Perfect for side projects and small apps
- 10,000 emails / month
- 2 mail servers
- 5 sending domains
- SMTP & API v2 access
- Email templates
- Click & open tracking
- Community support
Growth
For growing teams and production apps
- 50,000 emails / month
- 10 mail servers
- 25 sending domains
- Everything in Starter, plus:
- Marketing campaigns
- Contact list management
- Email validation API
- Priority support
Business
For teams that need full control
- 500,000 emails / month
- Unlimited mail servers
- Unlimited domains
- Everything in Growth, plus:
- Audit log & compliance
- Team roles & permissions
- Dedicated IP pool
- SLA & phone support
Built for developers who ship fast
REST API v2
Send emails, validate addresses, query messages, and pull statistics — all with a single API key.
Template Engine
Define templates with {{variables}}, then send personalized emails at scale using the API or campaigns.
Webhook Events
8 event types including MessageSent, MessageBounced, MessageLinkClicked, and more. HMAC signed payloads.
Frequently asked questions
CubeMails handles both transactional and marketing emails. Send password resets, order confirmations, and notifications via the API, or create marketing campaigns with contact lists and templates.
CubeMails offers the same features — SMTP, API, webhooks, tracking, templates, campaigns — with flat monthly pricing instead of per-email fees. Plus email validation, audit logs, and team roles built in.
Yes. CubeMails requires domain verification with guided SPF, DKIM, and return path setup. Our onboarding wizard walks you through every DNS record.
Every new account gets free access with 1,000 emails/month. Upgrade anytime to unlock more capacity, campaigns, and team features. No credit card required.
Yes. Our API v2 includes an email validation endpoint that checks format, MX records, and disposable domain detection. Validate emails before sending to reduce bounces.
CubeMails generates JWT-signed one-click unsubscribe links. When a recipient unsubscribes, they're automatically added to the server's suppression list.
Ready to own your email infrastructure?
Start free with 1,000 emails/month. No credit card required.