You do realise that SPF isn't really an anti-spam measure, don't you? All it does is confirm that you sent an email and that it was verified by your SPF record as being from your server. If a spammer creates an SPF record on some DNS server and sends you a spam email, it will pass all the SPF tests and end-up in your system. The SPF rules only check for the validity that a server is allowed to send mail, if it doesn't have SPF records then nothing will happen unless you modify the scores - not a good idea as most servers don't have SPF.
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Regards
Bill
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