To configure saslauthd to provide authentication for Exim4.

SASL can be used when Exim is supporting local user email accounts.

The first step is to install the sasl2-bin package from the Main repository.

sudo apt-get install sasl2-bin

Edit the /etc/default/saslauthd configuration file and set START=no to:

/etc/default/saslauthd

START=yes

Next the Debian-exim user needs to be part of the sasl group in order for Exim4 to use the saslauthd service:

sudo adduser Debian-exim sasl

Now start the saslauthd service:

sudo /etc/init.d/saslauthd start

Exim4 is now configured with SMTP AUTH using TLS and SASL authentication.