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.
#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: 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_NETWORKS=