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Fix "Could not establish trust relationship for the SSL/TLS secure channel" error

Today one of our clients received a System.Net.WebException error on a newly deployed ASP.NET web application. Part of the exception was: “System.Net.WebException: The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.“. Here is how we resolved that issue.

How to send authenticated SMTP over a TLS encrypted connection, in PHP, ASP and ASP.NET?

Send authenticated SMTP (auth-SMTP) over a TLS encrypted connection. If you want to send email securely from your website, this post is for you! In this post I’ll provide some script examples for ASP, PHP, and ASP.NET (C# / VB.Net) that you can easily integrate in your website.