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#1 Posted : Thursday, March 31, 2011 6:16:27 PM(UTC)

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Visual Basic Example

Validate 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("") 


            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:") 
        End Try 

    End Sub 
End Module 

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