Exim4 authenticated smarthost

Now, edit the file

sudo nano /etc/exim4/passwd.client

...and add the line *:login:password to the file, substituting the correct email account login name for login and corresponding password. Most ISPs offer multiple email accounts so it may make sense security wise to create an account just for utility use such as this. If your Linux host is ever compromised you will be glad you had a seperate utility email account.

Create the file

sudo touch /etc/exim4/exim4.conf.localmacros

Then edit that file

sudo nano /etc/exim4/exim4.conf.localmacros

...add the line

AUTH_CLIENT_ALLOW_NOTLS_PASSWORDS = 1

Exim4 supports TLS security. Enabling TLS support involves

sudo apt-get install openssl

then

sudo /usr/share/doc/exim4-base/examples/exim-gencert

then

sudo nano /etc/exim4/exim4.conf.localmacros

to add the line

MAIN_TLS_ENABLE = 1