EmailEngine
EmailEngine: A unified mailbox API for teams that need provider integrations, inbound events, and sending. Ranked #23 of 32 in Email APIs by our editors (6.4/10); pricing: 14-day trial; best for organizations unifying mailbox provider APIs.
At a glance
- Editor score6.4 / 10
- Pricing14-day trial
- Best forOrganizations unifying mailbox provider APIs
- Free planNo
- Paid from$1,450/yr
- Inbound emailYes
- Facts checked23 Sep 2026
Where it wins
- Connects IMAP, Gmail, and Microsoft accounts through one REST API
- Includes inbound webhooks, search, templates, SMTP routing, and sending
- Supports unlimited mailboxes, instances, API calls, and webhooks annually
Where it doesn't
- Annual pricing starts at $1,450, making it costly for sending-only needs
- Requires self-hosted deployment and Redis for storage
- No free plan; the full-function trial lasts 14 days
Our verdict on EmailEngine
EmailEngine is self-hosted software for applications that need programmable access to existing Gmail, Google Workspace, Microsoft 365, Outlook.com, and IMAP mailboxes. Its unified REST API covers reading, searching, synchronization, folder management, attachments, and sending through provider APIs or SMTP. That makes it relevant to SaaS products, CRMs, support systems, email clients, and AI agents that would otherwise maintain separate mailbox integrations. The product supports web, Windows, macOS, Linux, API, and self-hosted deployments, with OAuth2 authentication for Google and Microsoft accounts.
Its strongest distinction is breadth across mailbox operations rather than a narrow focus on outbound delivery. Real-time webhooks report new mail and mailbox changes, while stored Handlebars templates, mail merge, message filtering, SMTP gateway routing, and bounce detection extend the API beyond basic message access. Integrations include Gmail, Google Workspace, Microsoft 365, Outlook.com, IMAP, SMTP, Microsoft Graph, Redis, Slack, Discord, Zapier, and n8n. MCP server access also provides a path for AI agents that need mailbox functions. Choose EmailEngine when provider coverage and inbound mailbox control matter as much as sending.
The published annual plan costs $1,450 per year and includes unlimited connected mailboxes, unlimited instances, unlimited API calls and webhooks, all features, and updates during the subscription period. An enterprise perpetual license adds offline verification, invoice or wire payment, and custom contract and license terms. A 14-day full-function trial is available, but there is no free plan. Because deployment runs on infrastructure an organization controls and uses Redis for storage, it suits teams prepared to manage self-hosted software. Teams seeking only a general-purpose email sending API, or a lower-cost entry plan, should consider a narrower alternative.
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EmailEngine pricing
All 2 EmailEngine plans and prices →
EmailEngine fact sheet
| Free plan | No |
|---|---|
| Paid from | $1,450/yr |
| Monthly send limit | Not verified |
| Inbound email | Yes |
| Delivery event webhooks | Yes |
| SMTP relay | Yes |
| Email templates | Yes |
| Dedicated IP option | Not verified |
| Free trial | 14 days · no card needed |
| Deployment | Self-hosted, Cloud, Desktop |
| Platforms | Web, Windows, macOS, Linux |
| Support | Email, Docs |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Integrations | 9 integrations: Gmail, Google Workspace, Microsoft 365, Outlook.com, IMAP-compatible email services, Slack … |
| Pricing | 14-day trial (source) |
| Website | emailengine.app |
| Facts checked | 23 Sep 2026 |
EmailEngine integrations
EmailEngine lists 9 integrations on its own site.
- Gmail
- Google Workspace
- Microsoft 365
- Outlook.com
- IMAP-compatible email services
- Slack
- Discord
- Zapier
- n8n
Alternatives to EmailEngine
- MailgunA mature email API with broad sending, inbound routing, tracking, and deliverability tools.9.7
- Twilio SendGrid Email APIA mature email API with broad developer features, but no ongoing free plan.9.3
- MailjetA broad email platform combining APIs, automation, campaigns, and collaboration.9.1
See all EmailEngine alternatives →
Also Ranked In
EmailEngine is ranked in 2 of our directories.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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