Changed: the SPF row on a Mail domain's page shows the complete record to publish. It keeps the entries already in the domain's SPF record, combines them into one record when the domain has several, and adds include:spf.magpie.diy. A domain without an SPF record gets one ending in ~all. Records that already use include:spf.magpiemeetings.com still pass.
The text on Mail's Domains, domain and Addresses pages is shorter.