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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.

Every team can send as soon as it is created. Sendmux includes a managed Amazon SES sending account, and you can add your own accounts when you need more control.

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Default managed account

The managed account is active by default. It is best for first sends and low-volume traffic.
SettingValue
Starting limit50 emails per day
Limit reset00:00 UTC
SetupNone
Editable credentialsNo
Delivery groupsNot supported
Managed Amazon SES is for transactional email only. Use your own provider for marketing, newsletters, or bulk promotional sends.
When usage reaches 80% of the daily limit, Request increase appears on Accounts. You can also call POST /providers/shared-amazon-ses-limit-request from the Management API. Submit the request once. Sendmux reviews it and emails the outcome.
If the managed account is inactive and no other active provider exists, sends fail with no_active_providers.

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Add your own account

Use your own provider when you need higher volume, a specific sender policy, or direct control of account credentials.
1

Open Accounts

Open Accounts and select Add Account.
2

Choose the provider type

Choose Custom SMTP, Gmail, or Outlook / Microsoft 365. HTTP API is visible as a coming-soon option.
3

Complete setup

SMTP accounts need server address, port, protocol, username, password, and optional sender defaults. Connected accounts send you through the provider’s sign-in flow.
4

Test the provider

For SMTP accounts, use Test Connection after saving. Fix any credential or network error before routing production mail through the account.

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Manage accounts by API

Use the Management API when you need to automate account operations.
TaskEndpoint
List accountsGET /providers
Add a custom SMTP accountPOST /providers
Update account metadata or SMTP settingsPATCH /providers/{public_id}
Activate or deactivate an accountPOST /providers/{public_id}/activate or POST /providers/{public_id}/deactivate
Test a custom SMTP accountPOST /providers/{public_id}/test
Read usage and limitsGET /providers/usage, GET /providers/limits
Request more custom-account capacityPOST /providers/limits/sending-accounts/request-increase
Request shared Amazon SES daily limit reviewPOST /providers/shared-amazon-ses-limit-request
Connected account setup still starts in the Sendmux app. After connection, the API can read, activate, deactivate, delete, and update safe account metadata.
The shared Amazon SES account is platform-managed. API clients can read it, activate or deactivate it, and request a daily limit increase. They cannot edit its credentials, quotas, routing weight, sender defaults, or delete it.

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Advanced settings

Advanced settings let you tune the provider without changing every send request.
SettingUse it for
From emailSet a default sender address for this provider.
From nameSet a default sender display name.
Reply-ToSend replies to a different mailbox.
Tracking domainRewrite eligible links through a custom tracking hostname.
QuotasSet per-second, per-minute, per-hour, or per-day caps on custom SMTP accounts.
Distribution percentageWeight traffic when several providers are eligible.
Delivery groupAdd the provider to a routing group.

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Account limits

Each team starts with 200 sending accounts that you add yourself. The managed account does not count towards this limit. When usage reaches 80%, Request increase appears on Accounts, and API clients can call POST /providers/limits/sending-accounts/request-increase.

Delivery groups

Group providers and route selected keys or mailboxes through them.

HTTP provider

See what the coming-soon provider type means.

Domains

Verify custom domains before using them for branded sending.

Deliverability

Watch bounce, complaint, and provider health signals.