SMTP relay

Send notifications through your configured SMTP relay.

This provider fills the mail slot. Configure it in Settings → Providers, or during first-run setup.

Settings

Key	Field	Type	Required	Notes
host	SMTP host	text	Yes	—
port	Port	number	No	587 for STARTTLS, 465 for implicit TLS, 25 for an internal relay that does not authenticate. Default: 587.
secure	Implicit TLS	yes / no	No	Defaults from the port: on for 465, STARTTLS otherwise.
user	Username	text	No	Leave empty for an internal relay that accepts unauthenticated mail from this host.
pass	Password	secret or reference	No	Paste the SMTP password (encrypted at rest), or use a reference: env:NAME / file:/path.
from	From address	text	Yes	Must be an address your relay will accept as a sender, or everything is rejected after the connection succeeds.
testRecipient	Send the test message to	text	No	Only used when you press Test. Nothing is sent here otherwise.

Note

One field is a secret (pass). Pasted secrets are encrypted before storage. You can also supply a reference resolved when it is used. env:NAME reads a process environment variable; file:/run/secrets/name reads a mounted secret file.

What the connection test checks

Select Test connection to run a live test against the credentials you supplied. Saving validates and stores the configuration. Every check below is evaluated against the real service, not inferred from the configuration.

Check	Outcome
Relay reachable and TLS negotiated	Must pass
Credentials accepted	Must pass
Test message accepted for delivery	Must pass

Adapter id: smtp-mail.