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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.

A mailbox is one email address on a verified custom domain or on the shared myagent.mx domain. It can send mail, receive mail, hold messages, and have its own passwords and sender rules.
Each team starts with 50 active mailboxes. See Team limits.

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Create a mailbox

1

Open Mailboxes

Open Mailboxes and select Create mailbox.
2

Choose the address

Enter a local part and choose a verified domain. Leave the local part blank if you want Sendmux to generate one.
3

Set display name and storage

Add an optional display name and choose 1 GB, 5 GB, or 50 GB storage.
4

Save the password

Copy the mailbox password when it appears. It is shown once.

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Mailbox passwords

Create one password per device, app, or integration. That makes revocation safer because you can remove one password without breaking every other connection. Mailbox passwords can be used for:
  • Sending through SMTP.
  • Authenticating mailbox-scoped API calls.
  • Connecting a mail client to the mailbox.
Use New password on the mailbox detail page to create another password. Use Revoke to disable one immediately.

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Sender identity

Open a mailbox and choose Edit sender identity to set:
  • Sender name.
  • Plain text signature.
  • HTML signature.
These values become the mailbox defaults. Individual API sends can still provide their own message fields.

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Sender rules

Sender rules control inbound mail for the mailbox.
Rule typeBehaviour
AllowDeliver only mail that matches trusted senders or domains.
BlockReject mail from known noisy or unwanted senders.
A mailbox can use allow rules or block rules, not both at the same time. Clear all rules before switching rule type. Rules run before a message is accepted into the mailbox. Rejected mail is not billed as accepted inbound usage.

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Suspend, resume, and delete

  • Suspend pauses inbound mail, outbound sends, mailbox API access, IMAP, and SMTP without deleting messages, passwords, or settings.
  • Resume restores mailbox access and sending from the mailbox address.
  • Delete removes the mailbox, its messages, API keys, and passwords.

Domains

Verify custom domains before creating branded mailboxes.

API keys

Create mailbox keys for API and mail client access.

Push delivery

Choose between polling, realtime events, webhooks, and the coming-soon push URL.

Webhooks

Receive inbound and delivery events at your HTTPS endpoint.

Mailbox API

Stream live received-message events from a mailbox key.