nextcloud/compose.smtp.yaml

services:
  app:
    secrets:
      - smtp_password
    environment:
      - SMTP_AUTHTYPE
      - SMTP_HOST
      - SMTP_SECURE
      - SMTP_NAME
      - SMTP_PORT
      - SMTP_PASSWORD_FILE=/run/secrets/smtp_password
      - MAIL_FROM_ADDRESS
      - MAIL_DOMAIN

secrets:
  smtp_password:
    external: true
    name: ${STACK_NAME}_smtp_password