If you have IP addresses which should always be able to relay mail without having to authenticate first ,all you have to do is:

create the file /etc/alwaysrelay and add the IP addresses .

For example:

vi  /etc/alwaysrelay

Add the IPs,

Then, restart exim (/etc/init.d/exim restart or ‘service exim restart’)

After this either restart antirelayd or wait for a little while and it will automatically include these IPs in /etc/relayhosts

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