I create new ASP.NET web application that use SMTP to send message. The problem is the smtp was not authenticated from who send the message.
How can I make SMTP authenticated in my program? does C# have a class that have attribute for enter username and password?
This question is related to
c#
authentication
smtp
How do you send the message?
The classes in the System.Net.Mail namespace (which is probably what you should use) has full support for authentication, either specified in Web.config, or using the SmtpClient.Credentials property.
Set the Credentials property before sending the message.
Ensure you set SmtpClient.Credentials after calling SmtpClient.UseDefaultCredentials = false.
The order is important as setting SmtpClient.UseDefaultCredentials = false will reset SmtpClient.Credentials to null.
To send a message through TLS/SSL, you need to set Ssl of the SmtpClient class to true.
string to = "[email protected]";
string from = "[email protected]";
MailMessage message = new MailMessage(from, to);
message.Subject = "Using the new SMTP client.";
message.Body = @"Using this new feature, you can send an e-mail message from an application very easily.";
SmtpClient client = new SmtpClient(server);
// Credentials are necessary if the server requires the client
// to authenticate before it will send e-mail on the client's behalf.
client.UseDefaultCredentials = true;
client.EnableSsl = true;
client.Send(message);
Set the Credentials property before sending the message.
How do you send the message?
The classes in the System.Net.Mail namespace (which is probably what you should use) has full support for authentication, either specified in Web.config, or using the SmtpClient.Credentials property.
In my case even after following all of the above. I had to upgrade my project from .net 3.5 to .net 4 to authorize against our internal exchange 2010 mail server.
How do you send the message?
The classes in the System.Net.Mail namespace (which is probably what you should use) has full support for authentication, either specified in Web.config, or using the SmtpClient.Credentials property.
Set the Credentials property before sending the message.
Ensure you set SmtpClient.Credentials after calling SmtpClient.UseDefaultCredentials = false.
The order is important as setting SmtpClient.UseDefaultCredentials = false will reset SmtpClient.Credentials to null.
To send a message through TLS/SSL, you need to set Ssl of the SmtpClient class to true.
string to = "[email protected]";
string from = "[email protected]";
MailMessage message = new MailMessage(from, to);
message.Subject = "Using the new SMTP client.";
message.Body = @"Using this new feature, you can send an e-mail message from an application very easily.";
SmtpClient client = new SmtpClient(server);
// Credentials are necessary if the server requires the client
// to authenticate before it will send e-mail on the client's behalf.
client.UseDefaultCredentials = true;
client.EnableSsl = true;
client.Send(message);
How do you send the message?
The classes in the System.Net.Mail namespace (which is probably what you should use) has full support for authentication, either specified in Web.config, or using the SmtpClient.Credentials property.
In my case even after following all of the above. I had to upgrade my project from .net 3.5 to .net 4 to authorize against our internal exchange 2010 mail server.
Source: Stackoverflow.com