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What are relay's and relayers in terms of email server (linux)?

Posted on 2011-02-23
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What are relay's and relayers in terms of email server (linux)?
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Question by:sobeservices2
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A mail server that sends mail on behalf of another.  e.g. If I connect an email server to another and I send mail from my server through the other, the other is relaying my mail.  

Mail relaying by itself is not bad and is many times necessary, but *open relays* where anyone can connect and send mail through that server is a bad thing because of the abuse of spammers.
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