Ron owns the domain TechPerfect.net. He often receives bounces about messages he didn't send. After looking at all such mails, he is sure that someone is spamming e-mails and using his domain name. What will Ron do to ensure that his domain name is not exploited?

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Ron owns the domain TechPerfect.net. He often receives bounces about messages he didn't send. After looking at all such mails, he is sure that someone is spamming e-mails and using his domain name. What will Ron do to ensure that his domain name is not exploited?