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Failure sending mail. Unable to read data from the transport connection: net_io_connectionclosed
설명
During the verify settings from Mail Settings a message error is exhibited: "Failure sending mail. Unable to read data from the transport connection: net_io_connectionclosed"
원인
Either user or password used to authenticate are incorrect.
해결 방안
WORKAROUND
Revise the entered credentials logon provided for authentication.