Can I use both API and SMTP on the same account?

Yes. You can connect different workloads through whichever method fits them best, API for your product or SMTP for a sequencer, on the same Mission Inbox account.

Do webhooks retry if my endpoint is down?

Yes. Delivery events are retried until your endpoint acknowledges them, so a brief outage on your side will not cause you to lose event data.

Which SDKs are available?

Official SDKs are available for Node.js, Python, Ruby, PHP, Go and Java. The underlying REST API can also be used with any language capable of making an HTTP request.

Does switching from SMTP to API require re-platforming?

No. Both methods send through the same Cube and MI Shield protection, so you can move from one to the other without changing your underlying infrastructure.

Infrastructure / API, SMTP & Integrations

Connect through API, SMTP or your existing tools.

Send through a REST API, drop in SMTP credentials, or connect the tools you already use. Most teams are sending within an hour and nothing about how you work has to change.

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Six Languages

RESTful API with SDKs

Plug-and-play

SMTP connection

Real-time

Webhooks & delivery events

How you connect

Whatever your stack looks like, there's a way in.

RESTful API

SDKs across six languages

Send, track and manage email straight from your codebase. The Mission Inbox API is RESTful and documented, with official SDKs so your team isn't writing raw HTTP calls.

Plug-and-play SMTP

Connect your existing tool in minutes

No API integration required. Point any SMTP-compatible sequencer, CRM or application at Mission Inbox and start sending through your Cube immediately.

Real-time Webhooks

Know what happened, as it happens

Delivered, bounced, opened and blocked events are pushed to your endpoint in real time, so your product or dashboard always reflects what's actually happening to your email.

API, SMTP & Integrations FAQs

Connect however your stack already works.

API, SMTP or both. Same infrastructure, same protection, underneath either one.

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