The following vb.net example codes demonstrate how to send email using Yahoo SMTP server.
Yahoo SMTP Server
Yahoo SMTP server address is
smtp.mail.yahoo.com. It supports both Normal/Implicit
SSL/Explicit SSL (TLS) connection to do user authentication, and you should use
your Yahoo email address as the user name for ESMTP authentication.
If you want to use implicit SSL connection with Yahoo SMTP server, you must set the port to 465.
Before you can use the following codes, please download EASendMail SMTP Component and install it on your machine at first. Full sample proejcts are included in this installer.
Install from NuGet
You can also install the run-time assembly by NuGet. Run the following command in the NuGet Package Manager Console:
If you install it by NuGet, no sample projects are installed, only .NET assembly is installed.
To use EASendMail SMTP Component in your project, the first step is
of EASendMail to your project. Please create or open your project with Visual Studio,
then go to
Add Reference ->
Browse..., and select
Installation Path\Lib\net[version]\EASendMail.dll from your disk, click
OK, the reference of EASendMail
will be added to your project, and you can start to use it to send email
in your project.
Because EASendMail has separate builds for .Net Framework, please refer to the following table and choose the correct dll.
Separate builds of run-time assembly for .NET Framework 1.1, 2.0, 3.5, 4.0, 4.5, 4.6.1, .NET Core 3.1, .NET 5.0, .NET Standard 2.0 and .NET Compact Framework 2.0, 3.5.
|File||.NET Framework Version|
Built with .NET Framework 2.0
It requires .NET Framework 2.0, 3.5 or later version.
Built with .NET Framework 4.0
It requires .NET Framework 4.0 or later version.
Built with .NET Framework 4.5
It requires .NET Framework 4.5 or later version.
Built with .NET Framework 4.6.1
It requires .NET Framework 4.6.1 or later version.
Built with .NET Core 3.1
It requires .NET Core 3.1 or later version.
Built with .NET 5.0
It requires .NET 5.0 or later version.
Built with .NET Standard 2.0
It requires .NET Standard 2.0 or later version.
Built with .NET Compact Framework 2.0
It requires .NET Compact Framework 2.0, 3.5 or later version.
Built with .NET Compact Framework 3.5
It requires .NET Compact Framework 3.5 or later version.
If you got authentication error, you need to enable Allowing less secure apps in your Yahoo account. Or you can generate App Passwords and use this app password instead of your user password.
Although Yahoo supports OAUTH, but it doesn’t provide mail permission, so OAUTH is not a solution for Yahoo mail.
The following example codes demonstrate sending email using Yahoo SMTP server.
In order to run it correctly, please change
recipient value to yours.
To get full sample projects, please download and install EASendMail on your machine.
' Add EASendMail Namespace Imports EASendMail Module Module1 Sub Main() Try Dim oMail As New SmtpMail("TryIt") ' Your Yahoo email address oMail.From = "firstname.lastname@example.org" ' Set recipient email address, please change it to yours oMail.To = "email@example.com" ' Set email subject oMail.Subject = "test email from yahoo account" ' Set email body oMail.TextBody = "this is a test email sent from VB.NET project with yahoo" ' Yahoo SMTP server address Dim oServer As New SmtpServer("smtp.mail.yahoo.com") ' For example: your email is "firstname.lastname@example.org", then the user should be "email@example.com" oServer.User = "firstname.lastname@example.org" oServer.Password = "yourpassword" ' Because yahoo deploys SMTP server on 465 port with direct SSL connection. ' So we should change the port to 465, you can also use 25 or 587 port oServer.Port = 465 ' detect SSL/TLS type automatically oServer.ConnectType = SmtpConnectType.ConnectSSLAuto Console.WriteLine("start to send email over SSL ...") Dim oSmtp As New SmtpClient() oSmtp.SendMail(oServer, oMail) Console.WriteLine("email was sent successfully!") Catch ep As Exception Console.WriteLine("failed to send email with the following error:") Console.WriteLine(ep.Message) End Try End Sub End Module
TLS is the successor of SSL, more and more SMTP servers require
TLS 1.2 encryption now.
If your operating system is
Windows XP/Vista/Windows 7/Windows 2003/2008/2008 R2/2012/2012 R2, you need to
enable TLS 1.2 protocol in your operating system like this:
Enable TLS 1.2 on Windows XP/Vista/7/10/Windows 2008/2008 R2/2012
If you have any comments or questions about above example codes, please click here to add your comments.