VB.NET - Send email using Yahoo SMTP server¶

Installation¶

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:

Install-Package EASendMail

Add reference¶

To use EASendMail SMTP Component in your project, the first step is Add reference of EASendMail to your project. Please create or open your project with Visual Studio, then go to menu -> Project -> Add Reference -> .NET -> Browse..., and select Installation Path\Lib\net[version]\EASendMail.dll from your disk, click Open -> OK, the reference of EASendMail will be added to your project, and you can start to use it to send email in your project.

.NET assembly¶

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 2.0, 3.5, 4.0, 4.5, 4.6.1, 4.7.2, 4.8.1, .NET 5.0, .NET 6.0, .NET 7.0, .NET 8.0, .NET Standard 2.0 and .NET Compact Framework 2.0, 3.5.

VB.NET - Send email using Yahoo SMTP server - example¶

The following example codes demonstrate sending email using Yahoo SMTP server. In order to run it correctly, please change SMTP server, user, password, sender, recipient value to yours.

' Add EASendMail Namespace
Imports EASendMail

Module Module1

    Sub Main()

        Try
            Dim oMail As New SmtpMail("TryIt")

            ' Your Yahoo email address
            oMail.From = "myid@yahoo.com"

            ' Set recipient email address, please change it to yours
            oMail.To = "support@emailarchitect.net"

            ' 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 "myid@yahoo.com", then the user should be "myid@yahoo.com"
            oServer.User = "myid@yahoo.com"
            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 1.2 protocol¶

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