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What causes “Relaying denied. Proper Authentication required.”?

April 26, 2017authentication causes Denied relaying

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What causes “Relaying denied. Proper Authentication required.”?

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The CS mail server requires authentication to send mail from a non-CS address to another non-CS address. This is needed to prevent spam abuse. Please see the question on using the department’s SMTP server from off campus for instructions on how to authenticate.