EmailEngine vs SMTP2GO
EmailEngine
emailengine.app
SMTP2GO
smtp2go.comSide by side
| Figure | EmailEngine | SMTP2GO |
|---|---|---|
| Price from | $120.83/mo | $8.33/mo |
| Free plan | — | Yes |
| Free trial | Yes | — |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | Yes | — |
| macOS | Yes | — |
| Linux | Yes | — |
| API | Yes | Yes |
| Self-hosted | Yes | — |
| Plans published | 2 | 6 |
| Spec score · Email APIs | 8.6 (#4) | 7.9 (#18) |
| Authentication | It offers managed OAuth2, Google Workspace service accounts, Microsoft 365 app-only access, and shared or delegated mailbox support. | SMTP2GO supports SPF and DKIM authentication for sender domains. |
| Compliance | EmailEngine does not come with SOC 2 or ISO 27001 certification; its compliance posture depends on the environment where it is deployed. | SMTP2GO states that it is GDPR compliant and ISO 27001 and ISO 9001 certified. |
| Headquarters | Tallinn, Estonia | New Zealand |
| Intended users | The maker describes CRM, SaaS and AI businesses, and teams with data-residency requirements or many mailboxes, as fitting use cases. | Subaccounts are designed for agencies, MSPs and resellers that need to separate customer data. |
| Support | The maker says support goes directly to the developer who wrote the code, and its annual subscription includes developer support. | SMTP2GO provides localized 24/7 support through live chat, email tickets and phone, with free-plan phone and chat support limited to 14 days. |
Plans
EmailEngine
- Annual subscription$1,450 a year
- Enterprise perpetual licencePriced on request
SMTP2GO
- FreeFree
- Starter$10 a month
- Professional$75 a month
- Starter$100 a year
- Professional$750 a year
- PremierPriced on request
In their own words
EmailEngine
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.