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EmailEngine

emailengine.app

From $120.83/mo Free trial WebWindowsmacOSLinuxAPISelf-hosted
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Spec score 8.6 #4 of 31 in Email APIs

What it is

EmailEngine is a self-hosted email API that connects Gmail, Microsoft 365, and IMAP mailboxes through a unified REST API. It sends webhooks when mailbox messages or state change, and can send mail through the connected account’s SMTP server or provider API. Native integrations use the Gmail API and Microsoft Graph; authentication options include managed OAuth2, service accounts for Google Workspace, Microsoft 365 app-only access, and shared or delegated mailboxes. An optional MCP server, currently in beta, lets connected AI clients search, read, file, draft, and send email with approved access. The admin interface shows sync status and queue details, with a Prometheus endpoint and Grafana dashboard for operations. EmailEngine runs on the customer’s infrastructure, uses Redis for sync metadata, and fetches message bodies on demand rather than storing them. A server and Redis using the noeviction policy are required. The annual subscription is $1,450 a year, excluding VAT where applicable, and includes developer support; each installation can start a full-functionality 14-day trial without signup or a credit card.

Spec sheet

Product
EmailEngine is a self-hosted email API that connects existing Gmail, Microsoft 365 and IMAP mailboxes through a unified REST API.Read 8 Oct 2026 · emailengine.app
Intended users
The maker describes CRM, SaaS and AI businesses, and teams with data-residency requirements or many mailboxes, as fitting use cases.Read 8 Oct 2026 · emailengine.app
Trial
Each installation can start a full-functionality 14-day trial from its dashboard without signup or a credit card.Read 8 Oct 2026 · emailengine.app
Security
Stored mailbox credentials and OAuth2 tokens can be encrypted with AES-256-GCM when the deployment’s EENGINE_SECRET key is configured.Read 8 Oct 2026 · emailengine.app
Compliance
EmailEngine does not come with SOC 2 or ISO 27001 certification; its compliance posture depends on the environment where it is deployed.Read 8 Oct 2026 · emailengine.app
Support
The maker says support goes directly to the developer who wrote the code, and its annual subscription includes developer support.Read 8 Oct 2026 · emailengine.app
Headquarters
Tallinn, EstoniaRead 28 Sep 2026 · emailengine.app
Maker
EmailEngine is made by Postal Systems OÜ, an Estonian company based in Tallinn; its about page identifies Andris Reinman as the founder and developer.Read 8 Oct 2026 · emailengine.app
AI agents
An optional MCP server, currently in beta, lets connected AI clients search, read, file, draft and send email with approved access.Read 8 Oct 2026 · emailengine.app
Authentication
It offers managed OAuth2, Google Workspace service accounts, Microsoft 365 app-only access, and shared or delegated mailbox support.Read 8 Oct 2026 · emailengine.app
Data handling
EmailEngine runs on the customer’s infrastructure, caches sync metadata in the customer’s Redis, and fetches message bodies on demand rather than storing them.Read 8 Oct 2026 · emailengine.app
Deployment requirement
Running EmailEngine requires a server and Redis, which must use the noeviction policy.Read 8 Oct 2026 · emailengine.app
Email handling
It sends webhooks when mailbox messages or state change and can send email through the connected account’s SMTP server or provider API.Read 8 Oct 2026 · emailengine.app
Notable limits
It does not support POP3, ActiveSync or Exchange Web Services, and it does not keep a sent-mail archive or webhook delivery history.Read 8 Oct 2026 · emailengine.app
Operations
The admin interface includes account sync status and queue inspection, and the product provides a Prometheus endpoint and Grafana dashboard.Read 8 Oct 2026 · emailengine.app
Provider integrations
It supports Gmail and Google Workspace, Microsoft 365 and Outlook.com, plus IMAP servers; native integrations use Gmail API and Microsoft Graph.Read 8 Oct 2026 · emailengine.app

Plans and prices

Annual subscription $1,450 a year Renews annually; prices exclude VAT where applicable. Unlimited connected mailboxes · unlimited production, staging and development instances · unlimited API calls and webhooks · support directly from the developer Read 8 Oct 2026 · emailengine.app
Enterprise perpetual licence Priced on request Paid once; contact for terms and pricing. Perpetual licence · offline verification · invoice or wire transfer · custom contract and licence terms · same features and support Read 8 Oct 2026 · emailengine.app

Every EmailEngine plan and price →

Strong points and limits

Strong points

  • Unified API connects Gmail, Microsoft 365, and IMAP
  • Mailbox changes trigger webhooks
  • Message bodies are fetched on demand
  • Full-functionality trial needs no signup or card

Limits

  • Annual subscription costs $1,450 a year
  • Requires a server and Redis with noeviction policy
  • Does not support POP3, ActiveSync, or Exchange Web Services
  • No sent-mail archive or webhook delivery history

Who it suits

It suits CRM, SaaS, and AI businesses, as well as teams with data-residency needs or many mailboxes. It requires a self-managed server and Redis.

Verdict

EmailEngine offers a self-hosted route to mailbox connections, email sending, and event webhooks. Its deployment requirements and unsupported protocols are important checks before purchase.

Where Specifiction places it

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