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For comparison, my settings (which work) are the same, except port = 587 (as JavaLawyer suggests), and username = email@example.com (i.e. includes the "@gmail.com").
Would you please post the settings that finally worked out for you?
Are you also using mydlink for remote viewing?
Old post but still a running problem.I configured everything as above but the message is: Invalid username/passwordI verified the password through browser and reinserted it several times ans saved the config every time but it never worked.