.net mail process

Aug 28 2013 2:10 AM

hiiii.
i have creating a .net windows application mailing syatem. but when i am executing the program it will show an error message
message is

The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required. Learn more at.

how to solve it .? and my mail will properly process?

Answers (8)

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