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This additional computational overhead is a hallmark of digital postmarks, making sending bulk spam more (computationally) expensive. [20] This facet of DKIM may look similar to hashcash , except that the receiver side verification is a negligible amount of work, while a typical hashcash algorithm would require far more work.
Gmail is the email service provided by Google.As of 2019, it had 1.5 billion active users worldwide, making it the largest email service in the world. [1] It also provides a webmail interface, accessible through a web browser, and is also accessible through the official mobile application.