Send and received Email using ASP .NET Core web API 2.1

Step 1: Add MailKit NuGet package to ASP.NET Core project

MailKit is available as a NuGet package. Then add the following imports in code (it could be either a controller code or any standalone class).

using MailKit.Net.Smtp;
using MimeKit;

Step 2: Prepare an email message to be sent

A message is represented by MimeMessage class. The following code how the MimeMessage can be configured.

MimeMessage message = new MimeMessage();
MailboxAddress from = new MailboxAddress("Admin",
"[email protected]");
message.From.Add(from);
MailboxAddress to = new MailboxAddress("User",
"[email protected]");
message.To.Add(to);
message.Subject = "This is email subject";

Step 3 : Add email body and file attachments

Next, we need to set the message body and optionally add email attachments. The following code shows how this can be done:

BodyBuilder bodyBuilder = new BodyBuilder();
bodyBuilder.HtmlBody = "Hello World!";
bodyBuilder.TextBody = "Hello World!";

To attach one or more files to our message we need their physical file system paths. Instead of hard-coding the paths we will compute them using the IHostingEnvironment object as shown below:

IHostingEnvironment env = null;
public HomeController(IHostingEnvironment env)
{
this.env = env;
}

bodyBuilder.Attachments.Add(env.WebRootPath + "\\file.png");

Once the BodyBuilder is ready we can generate a MimeMessage body from it as follows:

message.Body = bodyBuilder.ToMessageBody();

Step 4: Connect and authenticate with the SMTP server In order to send the email message we just created, we need to connect with an SMTP server. The following code shows how a connection can be established with an SMTP server.

SmtpClient client = new SmtpClient();
client.Connect("smtp_address_here", port_here, true);
client.Authenticate("user_name_here", "pwd_here");

We then proceed to call Authenticate() method that authenticates a user account with the SMTP server.

Step 5: Send an email message

After configuring the SMTP server connection we can now send a message and then disconnect from the server.

client.Send(message);
client.Disconnect(true);
client.Dispose();

The Send() message accepts a MimeMessage as a parameter and attempts to send that message. Once a message has been sent, we can disconnect from the server using the Disconnect() method.

To test our code, fill valid values for from address, to address, and SMTP server configuration and then attempt to run the code.

That's it for now! Keep coding!!

4 Replies

Know the answer? Post it — somebody with the same question will find it here.

Mageshwaran R5y ago
Accepted answer
Hi Umar,
Please refer this link,
https://www.c-sharpcorner.com/article/send-email-using-asp-net-mvc-and-web-api/
Umar mehmood5y ago
Thanks guys for your responce.but i am looking for microsoft graph api to send the email using office365 outlook.
Kiran Mohanty5y ago
Hi.
Please refer below link.
https://www.infoworld.com/article/3534690/how-to-send-emails-in-aspnet-core.html
Aman Gupta5y ago
Step 1: Add MailKit NuGet package to ASP.NET Core project
MailKit is available as a NuGet package. Then add the following imports in code (it could be either a controller code or any standalone class).
using MailKit.Net.Smtp;
using MimeKit;
Step 2: Prepare an email message to be sent

A message is represented by MimeMessage class. The following code how the MimeMessage can be configured.
MimeMessage message = new MimeMessage();
MailboxAddress from = new MailboxAddress("Admin",
"[email protected]");
message.From.Add(from);
MailboxAddress to = new MailboxAddress("User",
"[email protected]");
message.To.Add(to);
message.Subject = "This is email subject";
Step 3 : Add email body and file attachments
Next, we need to set the message body and optionally add email attachments. The following code shows how this can be done:
BodyBuilder bodyBuilder = new BodyBuilder();
bodyBuilder.HtmlBody = "Hello World!";
bodyBuilder.TextBody = "Hello World!";

To attach one or more files to our message we need their physical file system paths. Instead of hard-coding the paths we will compute them using the IHostingEnvironment object as shown below:
IHostingEnvironment env = null;

public HomeController(IHostingEnvironment env)
{
this.env = env;
}
bodyBuilder.Attachments.Add(env.WebRootPath + "\\file.png");
Once the BodyBuilder is ready we can generate a MimeMessage body from it as follows:
message.Body = bodyBuilder.ToMessageBody();

Step 4: Connect and authenticate with the SMTP server In order to send the email message we just created, we need to connect with an SMTP server. The following code shows how a connection can be established with an SMTP server.

SmtpClient client = new SmtpClient();
client.Connect("smtp_address_here", port_here, true);
client.Authenticate("user_name_here", "pwd_here");
We then proceed to call Authenticate() method that authenticates a user account with the SMTP server.
Step 5: Send an email message
After configuring the SMTP server connection we can now send a message and then disconnect from the server.

client.Send(message);
client.Disconnect(true);
client.Dispose();

The Send() message accepts a MimeMessage as a parameter and attempts to send that message. Once a message has been sent, we can disconnect from the server using the Disconnect() method.

To test our code, fill valid values for from address, to address, and SMTP server configuration and then attempt to run the code.

That's it for now! Keep coding!!