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Platform : ASP.NET
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Category : Mail

How do I resolve the error "The server rejected one or more recipient addresses. The server response was: 503 This mail server requires authentication. Please check your mail client settings"

CDOSYS supports username and password authentication, and version 1.1 of the .NET Framework added the Fields property to the MailMessage class, which lets you set arbitrary fields of the underlying CDOSYS object.
Refer Extending System.Web.Mail

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