Send Email

Use this node to deliver an email prepared by a To Email transformation node — for example, sending an alert email when a device alarm is created, or emailing a daily summary report to an operations team.

Configuration

Use system SMTP settings

Enabled (default) — use the platform-wide SMTP settings configured by the system administrator.
Disabled — use custom SMTP settings defined in this node, allowing different email nodes to use different SMTP servers.

Custom SMTP settings

When system settings are disabled, configure:

Protocol — smtp (default) or smtps (SMTP over SSL/TLS).
SMTP host — hostname or IP address of the SMTP server.
SMTP port — port number.
Timeout (ms) — socket read timeout. Default: 10000 (10 seconds).

Security

Enable TLS — use STARTTLS to upgrade the connection after the initial handshake.
TLS version — TLS protocol version when TLS is enabled. Default: TLSv1.2.
Username / Password — SMTP authentication credentials. Leave empty for anonymous access.

Proxy settings

Enable proxy — route SMTP traffic through a proxy server.
Proxy host / port / user / password — proxy connection details (authentication optional).

Force acknowledgement

Controlled globally by the ACTORS_RULE_EXTERNAL_NODE_FORCE_ACK environment variable. When true, the incoming message is acknowledged immediately and the email send operation runs asynchronously, preventing processing timeouts for slow SMTP servers or large attachments.

Message processing algorithm

Verify that the message type is SEND_EMAIL. If not, route via Failure.
If force acknowledgement is enabled, acknowledge the message immediately and create a copy.
Send the email asynchronously using the system or custom SMTP configuration.
Route the original message (or copy) via Success on delivery, or Failure on error.

Output connections

Connection	Condition
`Success`	Email sent successfully.
`Failure`	Message type is not `SEND_EMAIL`, incorrect SMTP configuration, timeout, or unexpected error.

Examples

Example 1 — Send alert email via system SMTP

Type: SEND_EMAIL (produced by To Email node).

Data:

{
  "to": "alerts@company.com",
  "subject": "High Temperature Alert",
  "body": "<html><body><h2>Warehouse temperature has exceeded 30°C. Current: 32.5°C</h2></body></html>"
}

{
  "useSystemSmtpSettings": true,
  "smtpHost": "localhost",
  "smtpPort": 25,
  "smtpProtocol": "smtp",
  "timeout": 10000,
  "enableTls": false,
  "tlsVersion": "TLSv1.2",
  "enableProxy": false
}

Result: email delivered to alerts@company.com using system SMTP. Routes via Success.

JSON schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "TbSendEmailNodeConfiguration",
  "type": "object",
  "required": ["useSystemSmtpSettings"],
  "additionalProperties": false,
  "properties": {
    "useSystemSmtpSettings": { "type": "boolean" },
    "smtpHost": { "type": "string" },
    "smtpPort": { "type": "integer" },
    "smtpProtocol": { "type": "string", "enum": ["smtp", "smtps"] },
    "timeout": { "type": "integer" },
    "enableTls": { "type": "boolean" },
    "tlsVersion": { "type": "string" },
    "enableProxy": { "type": "boolean" },
    "proxyHost": { "type": "string" },
    "proxyPort": { "type": "string" },
    "proxyUser": { "type": "string" },
    "proxyPassword": { "type": "string" },
    "username": { "type": "string" },
    "password": { "type": "string" }
  }
}

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