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Add POSTFIX_STRIP_SENDER_HEADER Environment Variable #354

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Merged
crazy-max merged 2 commits into from
Oct 19, 2025
Merged

Add POSTFIX_STRIP_SENDER_HEADER Environment Variable #354

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cb62c69
add POSTFIX_STRIP_SENDER_HEADER var
AndrewPaglusch Aug 22, 2025
cbe414d
set default value for POSTFIX_STRIP_SENDER_HEADER env
crazy-max Oct 19, 2025
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1 change: 1 addition & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -158,6 +158,7 @@ linux/arm64

* `POSTFIX_DEBUG`: Enable debug (default `false`)
* `POSTFIX_MESSAGE_SIZE_LIMIT`: The maximal size in bytes of a message, including envelope information (default `26214400`)
* `POSTFIX_STRIP_SENDER_HEADER`: Strip the Sender header from incoming emails to prevent SES rejection issues (default `false`)
* `POSTFIX_SMTPD_TLS`: Enabling TLS in the Postfix SMTP server (default `false`, possible values: `true`|`may`|`encrypt`|`ask`|`require`, see [Postfix TLS README](https://www.postfix.org/TLS_README.html#client_tls_levels))
* `POSTFIX_SMTPD_TLS_CERT_FILE`: File with the Postfix SMTP server RSA certificate in PEM format
* `POSTFIX_SMTPD_TLS_ECCERT_FILE`: File with the Postfix SMTP server RSA private key in PEM format
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1 change: 1 addition & 0 deletions rootfs/etc/cont-init.d/00-env
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Expand Up @@ -83,6 +83,7 @@ MAIL_ENCRYPTION=${MAIL_ENCRYPTION:-null}

POSTFIX_DEBUG=${POSTFIX_DEBUG:-false}
POSTFIX_MESSAGE_SIZE_LIMIT=${POSTFIX_MESSAGE_SIZE_LIMIT:-26214400}
POSTFIX_STRIP_SENDER_HEADER=${POSTFIX_STRIP_SENDER_HEADER:-false}
POSTFIX_SMTPD_TLS=${POSTFIX_SMTPD_TLS:-false}
POSTFIX_SMTP_TLS=${POSTFIX_SMTP_TLS:-false}
POSTFIX_RELAYHOST_AUTH_ENABLE=${POSTFIX_RELAYHOST_AUTH_ENABLE:-false}
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14 changes: 14 additions & 0 deletions rootfs/etc/cont-init.d/15-config-postfix.sh
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Expand Up @@ -257,6 +257,20 @@ EOL
chmod o= /etc/postfix/mysql-virtual-alias-domains-and-subdomains.cf
chgrp postfix /etc/postfix/mysql-virtual-alias-domains-and-subdomains.cf

if [ "$POSTFIX_STRIP_SENDER_HEADER" = "true" ]; then
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@crazy-max crazy-max Oct 18, 2025

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Can you also add the default value for this env at

docker/rootfs/etc/cont-init.d/00-env

Lines 84 to 92 in d5210af

POSTFIX_DEBUG=${POSTFIX_DEBUG:-false}
POSTFIX_MESSAGE_SIZE_LIMIT=${POSTFIX_MESSAGE_SIZE_LIMIT:-26214400}
POSTFIX_SMTPD_TLS=${POSTFIX_SMTPD_TLS:-false}
POSTFIX_SMTP_TLS=${POSTFIX_SMTP_TLS:-false}
POSTFIX_RELAYHOST_AUTH_ENABLE=${POSTFIX_RELAYHOST_AUTH_ENABLE:-false}
POSTFIX_RELAYHOST_SSL_ENCRYPTION=${POSTFIX_RELAYHOST_SSL_ENCRYPTION:-false}
#POSTFIX_SPAMHAUS_DQS_KEY=${POSTFIX_SPAMHAUS_DQS_KEY:-null}
#POSTFIX_RELAYHOST_USERNAME=${POSTFIX_RELAYHOST_USERNAME:-null}
#POSTFIX_RELAYHOST_PASSWORD=${POSTFIX_RELAYHOST_PASSWORD:-null}

echo "Setting Postfix header_checks to strip Sender header"
cat >/etc/postfix/header_checks <<EOL
/^Sender:/ IGNORE
EOL
cat >>/etc/postfix/main.cf <<EOL

# Header checks configuration
mime_header_checks = regexp:/etc/postfix/header_checks
header_checks = regexp:/etc/postfix/header_checks
EOL
postmap /etc/postfix/header_checks
fi

if [ -f "/data/postfix-main.alt.cf" ]; then
cat "/data/postfix-main.alt.cf" > /etc/postfix/main.cf
fi
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