SMTP
SMTP is the resource Send Email sends through. It holds the server address, the credentials, the transport security mode, and a default sender address.
Port and Security work together: leaving the port at 0 derives it from the
security mode you choose, so most servers need only the host and credentials.
The resource has two tabs: Configuration and Advanced.
Configuration
| Field | Required | Description |
|---|---|---|
| Name | Optional | Name of the resource. |
| Description | Optional | Description of the resource. |
| Host | Optional | SMTP server hostname, for example smtp.gmail.com. Mapping and vault values are supported. |
| Username | Optional | Login user. Mapping and vault values are supported. |
| Password / OAuth2 Token | Optional | Password for Basic authentication; for OAuth2 this is the bearer token. Mapping and vault values are supported. |
| Default From | Optional | Default sender address. The Send Email activity or its input may override it. |
Advanced
| Field | Required | Description |
|---|---|---|
| Port | Optional | Defaults to 0, which derives the port from Security. |
| Security | Optional | STARTTLS, TLS/SSL, or None (plaintext). Defaults to STARTTLS. |
| Authentication | Optional | Basic (user + password), OAuth2 (XOAUTH2), or None. Defaults to Basic (user + password). |
| Connect Timeout (ms) | Optional | Defaults to 10000. |
| Read Timeout (ms) | Optional | Defaults to 30000. |
| Extra Properties | Optional | Additional mail.smtp.* properties. |
Derived ports
Leaving Port at 0 derives it from the security mode.
| Security | Port |
|---|---|
| STARTTLS | 587 |
| TLS/SSL | 465 |
| None (plaintext) | 25 |
info
Unsafe TLS overrides set through Extra Properties are ignored — this includes disabling hostname or certificate checks, or disabling STARTTLS.