From dff4a29a812192acd31cb0c88f8f6acea234caf9 Mon Sep 17 00:00:00 2001 From: turboaaa Date: Wed, 16 Jan 2019 12:38:15 -0500 Subject: [PATCH] Update README.md --- README.md | 3 +++ 1 file changed, 3 insertions(+) diff --git a/README.md b/README.md index d6ca131..f4574d5 100644 --- a/README.md +++ b/README.md @@ -31,6 +31,9 @@ The following env variables need to be passed to the container: * `SMTP_PASSWORD` Password of the SMTP user. * `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. + To use this container from anywhere, the 25 port needs to be exposed to the docker host server: docker run -d --name postfix -p "25:25" \