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Thank for your input. I will have to delve deeper into this.
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Thank for your input. I will have to delve deeper into this.

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When a user function or operation executes in our asp.net application, a confirmation email is sent out, using the SMTP credentials found in the web.config file. <br />
Q- When an external user has logged onto the application, and is performing the process, could their internal corporate firewall block the email being sent out by the app? I am not sure if the email is generated from the host server, or via the user's local session.<br />
Thanks for your input.
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When a user function or operation executes in our asp.net application, a confirmation email is sent out, using the SMTP credentials found in the web.config file. 
Q- When an external user has logged onto the application, and is performing the process, could their internal corporate firewall block the email being sent out by the app? I am not sure if the email is generated from the host server, or via the user's local session.
Thanks for your input.

Where is an asp.net SMTP email message physically generated from?

The successor to Active Server Pages, ASP.NET websites utilize the .NET framework to produce dynamic, data and content-driven web applications and services. ASP.NET code can be written using any .NET supported language. As of 2009, ASP.NET can also apply the Model-View-Controller (MVC) pattern to web applications

ASP.NET

The .NET Framework is not specific to any one programming language; rather, it includes a library of functions that allows developers to rapidly build applications. Several supported languages include C#, VB.NET, C++ or ASP.NET.

.NET Programming

Interactions between email servers and clients are governed by email protocols. The three most common email protocols are POP, IMAP and MAPI. Most email software operates under one of these (and many products support more than one).  The correct protocol must be selected, and correctly configured, if you want your email account to work.