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added option for SSL encryption for postfix relay #316

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merged 2 commits into from
Feb 15, 2025
Merged

added option for SSL encryption for postfix relay #316

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0f7e9ce
added option for SSL encryption for postfix relay
dgc1980 Jan 22, 2025
cbfc1e0
missing POSTFIX_RELAYHOST_SSL_ENCRYPTION in env script
crazy-max Feb 15, 2025
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2 changes: 2 additions & 0 deletions Dockerfile
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Original file line number Diff line number Diff line change
Expand Up @@ -55,6 +55,8 @@ RUN apk --no-cache add \
shadow \
tar \
tzdata \
cyrus-sasl \
cyrus-sasl-login \
&& cp /etc/postfix/master.cf /etc/postfix/master.cf.orig \
&& cp /etc/postfix/main.cf /etc/postfix/main.cf.orig \
&& apk --no-cache add -t build-dependencies \
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3 changes: 2 additions & 1 deletion README.md
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Expand Up @@ -165,7 +165,8 @@ linux/arm64
* `POSTFIX_RELAYHOST_AUTH_ENABLE`: Enable client-side authentication for relayhost (default `false`)
* `POSTFIX_RELAYHOST_USERNAME`: Postfix SMTP Client username for relayhost authentication
* `POSTFIX_RELAYHOST_PASSWORD`: Postfix SMTP Client password for relayhost authentication
* `POSTFIX_SPAMHAUS_DQS_KEY`: Personal key for [Spamhaus DQS](#spamhaus-dqs-configuration)
* `POSTFIX_RELAYHOST_SSL_ENCRYPTION`: enable SSL encrpytion over SMTP where TLS is not available. (default `false`)
* `POSTFIX_SPAMAUS_DQS_KEY`: Personal key for [Spamhaus DQS](#spamhaus-dqs-configuration)

> [!NOTE]
> `POSTFIX_RELAYHOST_USERNAME_FILE` and `POSTFIX_RELAYHOST_PASSWORD_FILE` can be
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1 change: 1 addition & 0 deletions rootfs/etc/cont-init.d/00-env
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Expand Up @@ -85,6 +85,7 @@ 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}
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10 changes: 10 additions & 0 deletions rootfs/etc/cont-init.d/15-config-postfix.sh
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Expand Up @@ -165,8 +165,18 @@ smtp_tls_mandatory_ciphers = high
smtp_tls_ciphers = high
smtp_tls_mandatory_exclude_ciphers = MD5, DES, ADH, RC4, PSD, SRP, 3DES, eNULL, aNULL
smtp_tls_exclude_ciphers = MD5, DES, ADH, RC4, PSD, SRP, 3DES, eNULL, aNULL
EOL

if [ "$POSTFIX_RELAYHOST_SSL_ENCRYPTION" = "true" ]; then
cat >>/etc/postfix/main.cf <<EOL
smtp_tls_wrappermode = yes
smtp_tls_security_level = encrypt
EOL
else
cat >>/etc/postfix/main.cf <<EOL
smtp_tls_security_level = may
EOL
fi
fi

if [ "$POSTFIX_RELAYHOST_AUTH_ENABLE" = "true" ]; then
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