What is the Google-recommended SPF setting for a domain that uses Google Workspace as the primary mail system?
- v=spf1 include:_ghs.google.com ~all
- v=spf1 a:google.com mx ptr ~all
- v=spf1 a:aspmx.l.google.com -all
- v=spf1 include:_spf.google.com ~all
- v=spf1 include:_spf.google.com -all