Add instructions for local-only email publishing

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wunter8 2023-09-17 10:39:59 -06:00 committed by GitHub
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@ -466,6 +466,31 @@ $ dig A mx1.ntfy.sh +short
3.139.215.220
```
### Local-only email
If you want to send emails from an internal service on the same network as your ntfy instance, you do not need to
worry about DNS records at all. Define a port for the SMTP server and pick an SMTP server domain (can be
anything).
=== "/etc/ntfy/server.yml"
``` yaml
smtp-server-listen: ":25"
smtp-server-domain: "example.com"
smtp-server-addr-prefix: "ntfy-" # optional
```
Then, in the email settings of your internal service, set the SMTP server address to the IP address of your
ntfy instance. Set the port to the value you defined in `smtp-server-listen`. Leave any username and password
fields empty. In the "From" address, pick anything (e.g., "alerts@ntfy.sh"); the value doesn't matter.
In the "To" address, put in an email address that follows this pattern: `[topic]@[smtp-server-domain]` (or
`[smtp-server-addr-prefix][topic]@[smtp-server-domain]` if you set `smtp-server-addr-prefix`).
So if you used `example.com` as the SMTP server domain, and you want to send a message to the `email-alerts`
topic, set the "To" address to `email-alerts@example.com`. If the topic has access restrictions, you will need
to include an access token in the "To" address, such as `email-alerts+tk_AbC123dEf456@example.com`.
If the internal service lets you use define an email "Subject", it will become the title of the notification.
The body of the email will become the message of the notification.
## Behind a proxy (TLS, etc.)
!!! warning
If you are running ntfy behind a proxy, you must set the `behind-proxy` flag. Otherwise, all visitors are