Purpose

Mail server for the “Email” block: Microsoft 365, Gmail or a corporate server.

Connection fields

FieldRule and default valueExplanation
SMTP server
host		RequiredSet the value according to your service configuration.
Port
port		As configured
Default: 587
Range: 1–65535		Set the value according to your service configuration.
Connection security
security		As configured
Default: starttls		starttls — STARTTLS (port 587)
ssl — SSL/TLS (port 465)
none — No encryption (internal network only)
User (empty for no login)
username		As configuredSet the value according to your service configuration.
Sender address
sender		RequiredSet the value according to your service configuration.
Sender name
sender_name		As configuredSet the value according to your service configuration.
Maximum message size, MB
max_size_mb		As configured
Default: 20
Range: 1–100		Set the value according to your service configuration.
Password
secret		Separate protected fieldThe secret is not displayed after saving. An empty field in an existing connection preserves its current secret.

Setup and validation

  1. Create a connection and give it a clear name.
  2. Complete required fields and the separate secret field.
  3. Run “Test” and read the diagnostics.
  4. Save the connection and select it in the appropriate flow block.

“Test” confirms SMTP access and login without sending an email. To check sender and recipient, complete “Test message” and click “Send test message”. An empty password field in a saved connection uses the previously stored password.

Use in a flow

This connection is used by the “Email” block, not an ordinary data source or destination. A connection test does not send an email. The separate test-send action creates a real message. Check sender, recipients and server limits. If a response is lost, reconcile delivery before retrying.