postfix/.env.example

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# Mandatory: Server address of the SMTP server to use.
#SMTP_SERVER=
# Optional: (Default value: 587) Port address of the SMTP server to use.
#SMTP_PORT=
# Mandatory: Username to authenticate with.
#SMTP_USERNAME=
# Mandatory: Password of the SMTP user. (Not needed if SMTP_PASSWORD_FILE is used)
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#SMTP_PASSWORD=
# Mandatory: Server hostname for the Postfix container. Emails will appear to come from the hostname's domain.
#SERVER_HOSTNAME=
# Optional: This will add a header for tracking messages upstream. Helpful for spam filters. Will appear as "RelayTag: ${SMTP_HEADER_TAG}" in the email headers.
#SMTP_HEADER_TAG=
# Optional: Setting this will allow you to add additional, comma seperated, subnets to use the relay. Used like SMTP_NETWORKS='xxx.xxx.xxx.xxx/xx,xxx.xxx.xxx.xxx/xx'.
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#SMTP_NETWORKS=
# Optional: Set this to a mounted file containing the password, to avoid passwords in env variables.
#SMTP_PASSWORD_FILE=
# Optional: Set this to yes to always add missing From:, To:, Date: or Message-ID: headers.
#ALWAYS_ADD_MISSING_HEADERS=yes
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# Optional: This will rewrite the from address overwriting it with the specified address for all email being relayed.
#OVERWRITE_FROM="Your Name" <email@company.com>