Infobip Email API vs Posta
Infobip Email API
infobip.com
Posta
goposta.devSide by side
| Figure | Infobip Email API | Posta |
|---|---|---|
| Price from | — | Free |
| Free plan | — | Yes |
| Free trial | Yes | — |
| Open source | — | — |
| Web | Yes | Yes |
| API | Yes | Yes |
| Self-hosted | — | Yes |
| Plans published | 2 | 1 |
| Spec score · Transactional email services | 8.5 (#12) | 8.0 (#26) |
| Spec score · Transactional Email Software | 8.5 (#12) | 7.9 (#25) |
| Delivery methods | both | both |
| Event webhooks | Yes | Yes |
| Inbound email | Replies can be received on a configured inbound domain and delivered to customer systems through webhooks. | Posta can receive inbound mail through built-in SMTP with TLS or an authenticated webhook, and supports forwarding and real-time SSE notifications. |
| Integrations | Email is available inside Infobip Broadcast, Moments and Conversations, with web-interface and HTTP API workflows. | The maker lists official SDKs for Go, PHP, Java, and .NET, plus Prometheus integration and OAuth/SSO providers including Google, Keycloak, and authentik. |
| Template options | both | both |
| Webhooks | Webhook notifications can report delivery status, clicks, inbound messages and other events, using per-request URLs or subscription configuration. | Webhooks support event filters, HMAC signing, retries, and delivery tracking. |
| What it does | Infobip Email is a cloud service for transactional and marketing email with web, HTTP API and SMTP API delivery. | Posta is a self-hosted email delivery platform for sending and receiving email through an HTTP API. |
Plans
Infobip Email API
- Pay as you goPrice not published
- Email API pay-as-you-goPriced on request
In their own words
Infobip Email API
Infobip Email API has no write-up on Specifiction yet; its figures are above.
Posta
Posta is a free, AGPL-3.0 self-hosted platform for sending and receiving email through an HTTP API. It supports API sending, SMTP relay, inbound mail, and website form submissions. The REST API handles transactional, batch, and templated messages with attachments, scheduling, retries, and priority queues. Incoming mail can arrive through built-in SMTP with TLS or an authenticated webhook, with forwarding and real-time SSE notifications. Templates offer versioning, localization, visual editing, and preview; campaigns add scheduling, A/B testing, and send-rate throttling. Posta supports multiple SMTP providers, SPF, DKIM, and DMARC verification, plus SDKs for Go, PHP, Java, and .NET. Security controls include hashed API keys, optional expiration and IP allowlists, JWT authentication, roles, two-factor authentication, rate limiting, and session management. It runs on customer infrastructure, with Docker Compose startup, isolated workspaces, data import/export, and GDPR deletion tools.