CloudMailin Documentation

Steve Smith

 Receive and send email via HTTP. Forward inbound email to your app as JSON/multipart webhooks, plus transactional SMTP for outbound.

CloudMailin converts incoming emails into HTTP webhooks, delivering them to your application as JSON, multipart, or raw payloads in real time.
Configure custom domains and attachment storage direct to DigitalOcean Spaces, all managed through a simple dashboard or REST API. Plans scale from 10,000 emails per month into the millions, with no scalability concerns and instant provisioning.
We also offer outbound transactional email via API or SMTP, with DKIM signing, delivery tracking, and bounce handling built in.
Building agents? CloudMailin's remote MCP server lets AI assistants send email and check delivery status, and inbound mail arrives as clean, agent-ready JSON for your LLM pipelines.

Receive Email via HTTPS Webhook

Send Email via SMTP

Send Email via HTTP API

Emails Per Month

Maximum Message Size

Custom Inbound Domain

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