On Fri, Aug 7, 2020 at 07:12 AM, Jim Wilson wrote:
Separately, I think the short answer may be to simply add GIO to the DNS TXT entry for SPF on your domain by inserting "include:groups.io" before your "~all" or "-all" statement.
Giving this a try. However after discovering that there is apparently no A or CNAME record pointing to the groups.io sending IP address, and after reviewing the groups.io SPF record, I decided to go with the IP4 syntax:
"v=spf1 include:spf.protection.outlook.com ip4:66.175.222.12 -all"
