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If you are not using PRO ISP nameservers you will need to update your zonefile with the necessary SPF post. This will be done automatically if you are using PRO ISP nameservers and you can disregard the following information.

If you have not added any SPF post before and only send via our services you need to add this SPF post:

If you already have an existing SPF post (meaning TXT post with SPF data) you need to add: a:sespf.proisp.no in the list of approved senders.