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for example to add _spf.google.com and spf.constantcontact.com
already i have v=spf1 include:spf.protection.outlook.com -all
=spf1 include:spf.protection.outlook.com include:_spf.google.com include:spf.constantcontact.com include:_spf.google.com-all
V==spf1 include:spf.protection.outlook.com a include:_spf.google.com a include:spf.constantcontact.com a include:_spf.google.com-all
If you would like to add _spf.google.com and spf.constantcontact.com alongside your existing spf.protection.outlook.com part of the record you would need todo something such as...
v=spf1 include:spf.constantcontact.com include:_spf.google.com include:spf.protection.outlook.com -all
Hope this helps.