Publishing an SPF record involves adding a TXT record to your domain's DNS settings. Here are the steps to do so:
Log in to your domain's DNS management console. Add a new TXT record. In the name field, enter "@" or leave it blank depending on your provider. In the value field, enter your SPF policy. For example: v=spf1 include:example.com ~all. Save the changes.
This SPF record authorizes your domain to send emails through the specified servers. Make sure to regularly update this record if you add new email sending services.