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EmailEngine
What EmailEngine is
EmailEngine is a self-hosted email API from Postal Systems OÜ, an Estonian company based in Tallinn. It connects existing Gmail, Microsoft 365 and IMAP mailboxes through a REST API, providing one interface for sending and handling email across those accounts. It can send through a connected account’s SMTP server or provider API, and issue webhooks when messages arrive or mailbox state changes. Native connections use the Gmail API and Microsoft Graph; authentication options include managed OAuth2, Google Workspace service accounts, Microsoft 365 app-only access, and shared or delegated mailboxes.
The optional MCP server is in beta and lets connected AI clients search, read, file, draft and send email with approved access. The admin interface shows sync status and queues, with a Prometheus endpoint and Grafana dashboard for operations. EmailEngine runs on the customer’s infrastructure, keeps sync metadata in the customer’s Redis and fetches message bodies on demand. Credentials and OAuth2 tokens can be encrypted with AES-256-GCM when EENGINE_SECRET is configured. Annual subscription pricing is $1,450 a year, excluding VAT where applicable, and includes developer support; each installation can begin a full-functionality 14-day trial without signup or a credit card.
Who it suits
EmailEngine suits CRM, SaaS and AI businesses that need to connect many existing mailboxes through an API, as well as teams with data-residency requirements. It may also fit organizations that want account-level operational visibility and control over the infrastructure where email data is handled.
What it does well
- Connects Gmail, Microsoft 365 and IMAP through one REST API.
- Sends webhooks for message and mailbox-state changes.
- Supports managed OAuth2 and provider-specific authentication options.
- Includes sync-status and queue inspection in its admin interface.
- Can encrypt stored credentials and tokens with AES-256-GCM.
- Annual subscription includes direct developer support.
What to know first
- Requires a server and Redis configured with the noeviction policy.
- Does not support POP3, ActiveSync or Exchange Web Services.
- Does not keep a sent-mail archive or webhook delivery history.
- Does not include SOC 2 or ISO 27001 certification.
Limits
The 14-day trial provides full functionality. The annual subscription includes unlimited connected mailboxes, instances, API calls and webhooks; the product does not support POP3, ActiveSync or Exchange Web Services, and does not keep sent-mail archives or webhook delivery history.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Annual subscription | 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 | $1,450 a year |
| Enterprise perpetual licence | Paid once; contact for terms and pricing. · Perpetual licence · offline verification · invoice or wire transfer · custom contract and licence terms · same features and support | On request |
As emailengine.app lists them, read 8 Oct 2026. The maker's own page has the final word.
Getting started
- Visit the EmailEngine website.
- Prepare a server and Redis, using Redis’s noeviction policy.
- Deploy EmailEngine on your infrastructure.
- Start the 14-day full-functionality trial from the installation dashboard without signup or a credit card.
- Connect Gmail, Microsoft 365 or IMAP mailboxes and configure the available authentication method.
- Configure EENGINE_SECRET if you want stored credentials and OAuth2 tokens encrypted.
Verdict
Choose EmailEngine if you need a self-hosted API for existing Gmail, Microsoft 365 or IMAP mailboxes and want control over where it runs. Look elsewhere if you require POP3, ActiveSync, Exchange Web Services, a sent-mail archive or webhook delivery history. Its annual subscription is $1,450 a year, excluding VAT where applicable.
Questions
How much does EmailEngine cost?
The Annual subscription costs $1,450 a year and renews annually. Prices exclude VAT where applicable.
Is there a free plan or trial?
There is no free plan. Each installation can start a full-functionality 14-day trial from its dashboard without signup or a credit card.
Which mail services does EmailEngine connect?
It supports Gmail and Google Workspace, Microsoft 365 and Outlook.com, and IMAP servers. Native integrations use the Gmail API and Microsoft Graph.
Where does EmailEngine run and what does it require?
It runs on the customer’s infrastructure and requires a server and Redis configured with the noeviction policy.
Does EmailEngine have compliance certifications?
It does not come with SOC 2 or ISO 27001 certification; compliance depends on the deployment environment.
Who makes EmailEngine?
EmailEngine is made by Postal Systems OÜ, based in Tallinn, Estonia. Its about page identifies Andris Reinman as founder and developer.
Facts from EmailEngine's own pages
- AI agents
- An optional MCP server, currently in beta, lets connected AI clients search, read, file, draft and send email with approved access. · emailengine.app, 8 Oct 2026
- Authentication
- It offers managed OAuth2, Google Workspace service accounts, Microsoft 365 app-only access, and shared or delegated mailbox support. · emailengine.app, 8 Oct 2026
- Compliance
- EmailEngine does not come with SOC 2 or ISO 27001 certification; its compliance posture depends on the environment where it is deployed. · emailengine.app, 8 Oct 2026
- 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. · emailengine.app, 8 Oct 2026
- Deployment requirement
- Running EmailEngine requires a server and Redis, which must use the noeviction policy. · emailengine.app, 8 Oct 2026
- 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. · emailengine.app, 8 Oct 2026
- Headquarters
- Tallinn, Estonia · emailengine.app, 28 Sept 2026
- Intended users
- The maker describes CRM, SaaS and AI businesses, and teams with data-residency requirements or many mailboxes, as fitting use cases. · emailengine.app, 8 Oct 2026
- 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. · emailengine.app, 8 Oct 2026
- 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. · emailengine.app, 8 Oct 2026
- Operations
- The admin interface includes account sync status and queue inspection, and the product provides a Prometheus endpoint and Grafana dashboard. · emailengine.app, 8 Oct 2026
- Product
- EmailEngine is a self-hosted email API that connects existing Gmail, Microsoft 365 and IMAP mailboxes through a unified REST API. · emailengine.app, 8 Oct 2026
- Provider integrations
- It supports Gmail and Google Workspace, Microsoft 365 and Outlook.com, plus IMAP servers; native integrations use Gmail API and Microsoft Graph. · emailengine.app, 8 Oct 2026
- Security
- Stored mailbox credentials and OAuth2 tokens can be encrypted with AES-256-GCM when the deployment’s EENGINE_SECRET key is configured. · emailengine.app, 8 Oct 2026
- Support
- The maker says support goes directly to the developer who wrote the code, and its annual subscription includes developer support. · emailengine.app, 8 Oct 2026
- Trial
- Each installation can start a full-functionality 14-day trial from its dashboard without signup or a credit card. · emailengine.app, 8 Oct 2026
Where EmailEngine stands on Freedom251
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