Update README.md

Updated variable name.
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turboaaa 2019-01-19 23:55:18 -05:00 committed by GitHub
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@ -32,7 +32,7 @@ The following env variables need to be passed to the container:
* `SERVER_HOSTNAME` Server hostname for the Postfix container. Emails will appear to come from the hostname's domain.
The following env variable(s) are optional.
* `HEADER_TAG` This will add a header for tracking messages upstream. Helpful for spam filters. Will appear as "RelayTag: ${HEADER_TAG}" in the email headers.
* `SMTP_HEADER_TAG` This will add a header for tracking messages upstream. Helpful for spam filters. Will appear as "RelayTag: ${SMTP_HEADER_TAG}" in the email headers.
To use this container from anywhere, the 25 port needs to be exposed to the docker host server: