To authorizer Clearbooks to send emails on your behalf you will have to create SPF and DKIM records in your DNS.

The SPF record mechanism used by Clearbooks is shown below.

include:_spf.clearbooks.co.uk

For more information please click on the button below.

In order to sign your emails using DKIM please contact Clearbooks support for instructions.

Create a free OnDMARC account to test your configuration.