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What is a Hard Bounce?

April 26, 2017bounce hard

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What is a Hard Bounce?

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A hard bounce is an email message that has been returned to you because the recipient’s address is invalid. A hard bounce might occur because the domain name does not exist, the recipient is unknown, or there is a network problem on the recipient’s end.

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A hard bounce is an email message that has been returned to the sender because it either never existed or doesn’t exist anymore. It is permanently undeliverable. Causes include invalid addresses (domain name doesn’t exist, typos, username doesn’t exist, etc.) or the email recipient’s mail server has blocked your server. Examples include (reason: 550 user unknown), connection refused by and (reason: 550 host unknown). Servers will also interpret bounces differently, meaning a soft bounce on one server may be classified as a hard bounce on another. Also, the exact error message returned may be different between servers. One may return “user unknown” while another might say “invalid recipient” or “mailbox unavailable”.