However SPF does not appear configured in my Zoho account control panel.
SPF record lookup and validation for: presence.gr SPF records are published in DNS as TXT records.
The TXT records found for your domain are:
v=spf1 include:zoho.com ~all
Checking to see if there is a valid SPF record.
Found v=spf1 record for presence.gr:
v=spf1 include:zoho.com ~all
evaluating...
SPF record passed validation test with pySPF (Python SPF library)!