https://www.ionos.com/help/domains/configuring-mail-servers-and-other-related-records/using-an-spf-record-to-prevent-spam/ Especially for a business, it is important to prevent the sending of spam using your email addresses. An effective protection against abusive email sending is an SPF record that you can add to your domain at IONOS. You can use it to strictly define that only email coming from...