I run the website hosting, and I want to use Campaign monitor for email marketing.
However, the mail server company refuse to add the TXT entries into the DNS, as they are concerned
about reducing security and spam issues.
Is there another way round this problem?
Domain keys are not compulsory in order to use Campaign Monitor , just recommended. You can send without them, though your emails may go through more filtering on the way to the inbox.
Maybe you could ask your server company to elaborate on how adding an extra authentication method would reduce security? That's the opposite of what domain keys do.