Visual Basic ExampleValidate Email Address Syntax
Regular expression can be used to validate if an email address is in correct format. For example: you can use this "^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,6}$" pattern to verify if the email address has valid format.
Test Email Address
Even the email address has a valid format, it doesn't mean the email address is existed in real world. TestRecipients method can be used to test if the email address is valid.
' The following example codes demonstrate testing email address using MX DNS lookup
' To get full sample projects, please download and install EASendMail on your machine.
' To run it correctly, please change SMTP server, user, password, sender, recipient value to yours
' Add EASendMail namespace
Imports EASendMail
Module Module1
Sub Main()
Dim oMail As New SmtpMail("TryIt")
Dim oSmtp As New SmtpClient()
' Set sender email address, please change it to yours
oMail.From = "test@emailarchitect.net"
' Set recipient email address, please change it to yours
oMail.To = "support@emailarchitect.net"
' Do not set SMTP server address
Dim oServer As New SmtpServer("")
Try
Console.WriteLine("start to test email address ...")
oSmtp.TestRecipients(oServer, oMail)
Console.WriteLine("email address was verified!")
Catch ep As Exception
Console.WriteLine("failed to test email address with the following error:")
Console.WriteLine(ep.Message)
End Try
End Sub
End Module
If you have any comments or questions about above example codes, please add your comments here.
