The following vb.net example codes demonstrate how to send email using Hotmail, Outlook.com and Office 365 SMTP servers.
Hotmail, Outlook.com SMTP Server
Hotmail/Live/Outlook.com SMTP server address is
smtp.live.com. It requires explicit SSL (TLS)
connection to do user authentication, and you should use your Hotmail/Live/Outlook.com email
address as the user name for ESMTP authentication. For example: your email is
and then the user name should be
Office 365 SMTP Server
Office 365 SMTP server uses 587 port and explicit SSL (TLS) connection.
|smtp.office365.com||25, 587 (recommended)||TLS|
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 2.1 and .NET Compact Framework 2.0, 3.5.
|File||.NET Framework Version|
Built with .NET Framework 1.1
It requires .NET Framework 1.1, 2.0, 3.5 or later version.
Built with .NET Framework 2.0
It requires .NET Framework 2.0, 3.5 or later version.
Built with .NET Framework 3.5
It requires .NET Framework 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 2.1
It requires .NET Core 2.1 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.
The following example codes demonstrate sending email using Hotmail, Outlook, Office365 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 hotmail/outlook 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 hotmail account" ' Set email body oMail.TextBody = "this is a test email sent from VB.NET project with hotmail" ' Hotmail/Outlook SMTP server address Dim oServer As New SmtpServer("smtp.live.com") ' For office 365 account, please change server address to: ' Dim oServer As New SmtpServer("smtp.office365.com") ' User authentication should use your ' email address as the user name. oServer.User = "firstname.lastname@example.org" oServer.Password = "yourpassword" ' use 587 port oServer.Port = 587 ' detect SSL/TLS connection 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
Microsoft Live SMTP servers (Hotmail, Oultook personal account) have been extended to support authorization via the industry-standard OAuth 2.0 protocol. Using OAUTH protocol, user can do authentication by Microsoft Web OAuth instead of inputting user and password directly in application. This way is more secure, but a little bit complex.
Microsoft Office365 EWS servers have been extended to support authorization via the industry-standard OAuth 2.0 protocol. Using OAUTH protocol, user can do authentication by Microsoft Web OAuth instead of inputting user and password directly in application. This way is more secure, but a little bit complex.
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: