Port 465

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Various bits of code, scripts, and procedures were put together with information from John Simpson's qmail.jms1.net website. It's an excellent resource on managing and setting up a Qmail server.

An SSL-encrypted SMTP service so your users can send mail through your server without passing clear-text passwords across the network.

Set up the service directory, download John Simpson's SMTP run script, and set it's permissions:

cd /var/service
mkdir -m 1755 smtp-ssl
cd smtp-ssl
wget http://qmail.jms1.net/scripts/service-qmail-smtpd-run
mv service-qmail-smtpd-run run
chmod 700 run

Edit /var/service/smtp-ssl/run and set the appropriate options:

IP=<IP ADDRESS TO LISTEN ON>
PORT=465
SSL=1
FORCE_TLS=0
DENY_TLS=0
AUTH=1
REQUIRE_AUTH=1
ALLOW_INSECURE_AUTH=0
AUTH_CDB="$VQ/control/auth.cdb"
CHECKPW="/home/vpopmail/bin/vchkpw"

Unless for some reason you want to be using validrcptto on your authenticated SMTP services, you should disable it in the run script:

#VALIDRCPTTO_CDB="$VQ/control/validrcptto.cdb"
#VALIDRCPTTO_LIMIT=10
#VALIDRCPTTO_LOG=2

Set up the "log" directory, download its "run" script, and set its permissions:

mkdir -m 755 log
cd log
wget http://qmail.jms1.net/scripts/run.log
mv run.log run
chmod 700 run

If you created SSL certifcates using the Apache SSL instructions you can use the SSL certificate you created:

cd ~/cert
cat server.key server.crt > /var/qmail/control/servercert.pem

Create the symbolic link in /service to start the service:

ln -s /var/service/smtp-ssl /service/

CentOS 7 Firewall settings:

firewall-cmd --permanent --zone=public  --add-port=465/tcp
firewall-cmd --reload

Testing SMTP Auth connections

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