Send email in VB.Net with tls enabled server
问题 I am developing application for sending an email with TLS enabled SMTP server and this application I want to run on windows server 2003. When I run this same application on window server 2012 R2 its working perfect but it wont work on window server 2003. Is there any specific reason it wont work on window server 2003? Error: SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.1 Client was not authenticated. I used below code in my