It doesn't seem to me to be a great strategy to single out gmail when Microsoft's hotmail/live/outlook mailservers regularly fail to notify recipients that they have not delivered mail under the rule that 'Deliverability to Outlook.com is based on your reputation'. Mailserver admins are then encouraged to sign up for a microsoft account to help microsoft generate up to date metrics on mailservers. I am sure other major proprietary systems take similar 'closed-world' assumptions about transporting email?
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