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What happens when a mail is sent using sendmail to an unknown destination? Does it get returned to the sender?

April 26, 2017destination happens mail RETURNED sender sendmail sent unknown

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What happens when a mail is sent using sendmail to an unknown destination? Does it get returned to the sender?

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The Postmaster will notify you about that like this: Your message has encountered delivery problems to the following recipients: wekjhkjh@kljhksdh Unable to deliver to destination domain.Cannot resolve kljhksdh.