Added a note about exposing SMTP_PORT value
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@ -33,7 +33,7 @@ The following env variables need to be passed to the container:
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* `SMTP_PASSWORD` Password of the SMTP user.
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* `SERVER_HOSTNAME` Server hostname for the Postfix container. Emails will appear to come from the hostname's domain.
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To use this container from anywhere, the 25 port needs to be exposed to the docker host server:
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To use this container from anywhere, the 25 port or the one specified by `SMTP_PORT` needs to be exposed to the docker host server:
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docker run -d --name postfix -p "25:25" \
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-e SMTP_SERVER=smtp.bar.com \
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