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25
docker-compose.yml
version: "2.1" services: smtp: image: mailhog/mailhog command: ["-smtp-bind-addr", "0.0.0.0:25"] user: root expose: - 25 - 8025 ports: - 8025:8025 healthcheck: test: echo | telnet 127.0.0.1 25
from the containers declared on that same docker-compose.yml file, set the SMTP server to smtp:25.
smtp:25