Explain what is meant by an Open Mail Relay and explain its role in SPAM emails. ?

can some one answer this question   Explain what is meant by an Open Mail Relay and explain its role in SPAM emails. 

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  • 5 months ago
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    It's an email server with unprotected SMTP access.

    eg. Anyone can configure an email program (or spam sender program) to send mail through it, without any username or password being needed.

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