How exactly the SPF entry has to look like always depends on how you use the email service. What SPF does is explained in the article What is SPF? explained.

By default, the following entry in the form of a DNS record of type TXT is sufficient.

Host: yourdomain.eu
Contents: v=spf1 a mx -all
TTL: Doesn’t matter

Note that if you use external services such as use Newsletter2Go. Contact the relevant provider, who can give you the information on how to adapt the content.

Bei uns kannst du den TXT-Record in deinem myhosttech Kundencenter hinzufügen, wenn du links auf “Domains > Domaincenter” klickst, und danach rechts, bei deiner Domain auf “Details > DNS Records”.