Sometimes the Symantec Messaging Gateway (SMG) returns a results of spf=neutral instead of spf=none when no SPF record is present.
The SMG's MTA implements a default result of 'spf=neutral' if no result is explicitly noted. This means that if the DNS server returns any result for the domain in question, but does not return a SPF record, then the SMG will return spf=neutral. If the DNS server does not return any results for the domain in question, then the SMG will return spf=none.
No action is required as the SMG is working as designed.
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