@backstage/plugin-notifications-backend-module-email

Adds support for sending Backstage notifications as emails to users.

Supports sending emails using SMTP, SES, azure, sendmail, or stream (for debugging purposes).

Customizing email content

The email content can be customized with the notificationsEmailTemplateExtensionPoint. When you create this extension, you can set the custom NotificationTemplateRenderer to the module. To modify the contents, override the getSubject, getHtml and getText methods.

import { notificationsEmailTemplateExtensionPoint } from '@backstage/plugin-notifications-backend-module-email';
import { Notification } from '@backstage/plugin-notifications-common';

export const notificationsModuleEmailDecorator = createBackendModule({
  pluginId: 'notifications',
  moduleId: 'email.templates',
  register(reg) {
    reg.registerInit({
      deps: {
        emailTemplates: notificationsEmailTemplateExtensionPoint,
      },
      async init({ emailTemplates }) {
        emailTemplates.setTemplateRenderer({
          async getSubject(notification) {
            return `New notification from ${notification.source}`;
          },
          async getText(notification) {
            return notification.content;
          },
          async getHtml(notification) {
            return `<p>${notification.content}</p>`;
          },
        });
      },
    });
  },
});

Example configuration:

notifications:
  processors:
    email:
      # Transport config, see options at `config.d.ts`
      transportConfig:
        transport: 'smtp'
        hostname: 'my-smtp-server'
        port: 587
        secure: false
        username: 'my-username'
        password: 'my-password'

      # AWS SES
      # transportConfig:
      #   transport: 'ses'
      #   accessKeyId: 'my-access-key
      #   region: 'us-west-2'

      # Azure Communication Service
      # transportConfig:
      #   transport: 'azure'
      #   endpoint: 'https://my-endpoint.communication.azure.com'
      #   accessKey: 'my-access-key'      Optional: if not provided, Managed Identity will be used

      # sendmail
      # transportConfig:
      #   transport: 'sendmail'
      #   path: '/usr/sbin/sendmail'
      #   newline: 'unix'

      # The email sender address
      sender: 'sender@mycompany.com'
      replyTo: 'no-reply@mycompany.com'
      # Who to send email for broadcast notifications
      broadcastConfig:
        receiver: 'users'
      # Optional SES config
      # sesConfig:
      #   fromArn: 'arn:aws:ses:us-west-2:123456789012:identity/example.com'
      #   configurationSetName: 'custom-config'
      # How many emails to send concurrently, defaults to 2
      concurrencyLimit: 10
      # How much to throttle between emails, defaults to 100ms
      throttleInterval:
        seconds: 60
      # Cache configuration for email addresses
      # This is to prevent unnecessary calls to the catalog
      cache:
        ttl:
          days: 1
      # Notification filter which this processor will handle
      filter:
        # Minimum severity of the notification to send email
        minSeverity: high
        # Maximum severity of the notification to send email
        maxSeverity: critical
        # Topics that are excluded from sending email
        excludedTopics:
          - scaffolder
      # List of allowed email addresses to get notifications via email
      allowlistEmailAddresses:
        - john.doe@backstage.io
      # List of denied email addresses to get notifications via email
      denylistEmailAddresses:
        - jane.doe@backstage.io

See config.d.ts for more options for configuration.