smtp

Decide which version you want to install - Perl or C. The C version is faster for busier servers

• Perl version
  The jgreylist script needs to be installed where the SMTP run script can find it. Easiest place is the /var/qmail/bin directory:
  cd /var/qmail/bin
wget http://qmail.jms1.net/scripts/jgreylist

  The script should be owned by root, have the same group ID as the greylist user's group ID, and have permissions 0750. With these server install instructions, the group is nofiles.
  
chmod 0750 jgreylist


The validrcptto patch consults a CDB file, /var/qmail/control/validrcptto.cdb which should contain every valid email address and alias on your server. Rather than generate this list manually or try to create our own script to do it, we'll utilize John Simpson's mkvalidrcptto script.

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

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

IP=
PORT=587
SSL=0


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

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

IP=
PORT=465
SSL=1


Because spammers occasionally max out the number of SMTP connections (default 30), I usually call this service smtp and use it strictly for external SMTP connections. By running a separate SMTP service for the internal users, a spike in spammer activity doesn't cause connection issues for your internal users.

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

cd /var/service
mkdir -m 1755 smtp
cd smtp


There are a variety of SMTP services that you can configure on your mail server. If you plan on receiving email from the internet, you'll definitely need a Port 25 service.