Question 1: The set of MX records of a domain name specifies how email should be routed with the ________. | |||
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Question 2: The other alternative mentioned in the RFC is to use what appears to be a multi-homed ________ for a mail server. | |||
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Question 3: The ________ protocol establishes a store-and-forward network, and if a domain's mail servers are all offline, sending servers are required to queue messages destined for that domain to retry later. | |||
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Question 4: Some servers (such as ________ and Postfix 2.1 or later [2]) will attempt the next-furthest MX server after some types of temporary delivery failures, such as greeting failures[3]. | |||
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