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Documentation Index

Fetch the complete documentation index at: https://docs.sendmux.ai/llms.txt

Use this file to discover all available pages before exploring further.

Use the Sendmux Postman collections to try requests, save examples, and share API workflows with your team.
You need a Sendmux API key before sending authenticated requests. Create one in the Sendmux app under API Keys.

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Choose a collection

CollectionUse it forImport URL
Management APIManage sending accounts, domains, mailboxes, webhooks, and logs.https://docs.sendmux.ai/postman/sendmux-management.postman_collection.json
Mailbox APIRead and manage one mailbox using a mailbox-scoped credential.https://docs.sendmux.ai/postman/sendmux-mailbox.postman_collection.json
Sending APISend single or batch emails through the Sending API.https://docs.sendmux.ai/postman/sendmux-sending.postman_collection.json

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Import by URL

1

Open import

In Postman, select Import, then choose Link.
2

Paste the collection URL

Paste the URL for the collection you want to use, then select Continue.
3

Confirm the import

Review the collection name, then select Import.

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Configure authentication

Each collection uses a sendmux_api_key collection variable.
1

Open collection variables

In Postman, open the imported collection, then select Variables.
2

Set the API key

Set sendmux_api_key to your smx_ API key.
3

Save changes

Select Save before running requests.
Do not commit, publish, or share a collection after adding a real API key.

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Base URL variables

The collections include these base URL variables:
CollectionVariableDefault value
Management APImanagement_base_urlhttps://app.sendmux.ai/api/v1
Mailbox APImailbox_base_urlhttps://app.sendmux.ai/api/v1
Sending APIsending_base_urlhttps://smtp.sendmux.ai/api/v1
Change a base URL only if Sendmux support asks you to use a different endpoint.

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Update a collection

Re-import the same URL when you want the latest requests. The collection files use the same API descriptions as the Sendmux reference docs.

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Next steps

Management API

Read authentication, permissions, response formats, and rate limits.

Mailbox API

Use a mailbox-scoped credential for one mailbox.

Sending API

Send email through the HTTP API.

API keys

Create scoped keys for applications and integrations.