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2.4. Configuring SASL
This section provides details on configuring the saslauthd to provide authentication for Exim4.
The first step is to install the sasl2-bin package. From a terminal prompt enter the following:
sudo apt install sasl2-bin
To configure saslauthd edit the /etc/default/saslauthd configuration file and set START=no to:
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 systemctl start saslauthd.service
Exim4 is now configured with SMTP-AUTH using TLS and SASL authentication.