What is an e-mail header?

Digital Marketing
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What is an e-mail header?

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Email headers contain tracking information for an individual email, detailing the path a message took as it went through various mail servers. The headers contain time-stamps, IP addresses and sender/recipient information.

Email headers are usually used to see information such as who has sent and received a message, where the message has passed through a server, and what kind of errors may have prevented the email from reaching its intended destination