Cannot send email from an asp net 4 8 website in prod


ASP.NET is a popular programming language used for developing web applications. It provides a framework for building websites and web services. One issue that developers may encounter is the inability to send emails from an ASP.NET 4.8 in a environment. In this article, we will explore the possible causes of this problem and with examples.

Possible Causes

There can be several reasons why you are unable to send emails from your ASP.NET 4.8 website in a production environment. Let's discuss some of the common causes:

1. SMTP Configuration

The SMTP (Simple Mail Protocol) configuration plays a crucial role in emails. Ensure that the SMTP server settings are correctly configured in your web.config file. Here's an example of how to configure the SMTP settings:


Make sure to replace the placeholders with your actual SMTP server details.

2. Firewall or Antivirus Restrictions

Firewalls or antivirus software installed on the production server may block outgoing email connections. Check if any firewall rules or antivirus settings are preventing your ASP.NET application from sending emails. You may need to whitelist the SMTP server or configure the firewall to allow outgoing email connections.

3. Email Server Authentication

Some email servers require authentication before allowing email sending. Ensure that you have provided the correct credentials for authentication. Here's an example of how to authenticate with the SMTP server:

using System.Net;
using System.Net.Mail;

//  a new SmtpClient instance
SmtpClient smtpClient = new SmtpClient("", 587);

// Set the credentials
smtpClient.Credentials = new NetworkCredential("your-username", "your-password");

// Send the email
smtpClient.Send("", "", "Subject", "Body");

Replace the placeholders with the appropriate values for your SMTP server, credentials, and email details.

4. Email Content or Format

Check if the email content or format is causing any issues. Ensure that the email addresses, subject, and body are correctly formatted. Also, make sure that the email addresses are valid and not blocked by any spam filters.


Sending emails from an ASP.NET 4.8 website in a production environment can sometimes be challenging. However, by considering the possible causes mentioned above and the appropriate solutions, you can overcome this issue. Remember to configure the SMTP settings correctly, check for any firewall or antivirus restrictions, authenticate with the email server if required, and ensure the email content is properly formatted. By following these steps, you should be able to send emails successfully from your ASP.NET application.

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