Question

Email Address Checker

Asked by: rajpawan

Hi guys

I was wondering if there are any .NET API to validate the email address(Not using regular expression). Like checking the domain and verifying username exists. I am looking for Freeware. Help on this would be appreciated greatly!!

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Asked On
2009-11-05 at 07:02:19ID24874633
Topics

Programming for ASP.NET

,

Microsoft Visual C#.Net

Participating Experts
4
Points
500
Comments
7

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Answers

 

by: HairbrushPosted on 2009-11-05 at 07:04:19ID: 25750176

Why do you not want to use a regular expression?

 

by: rajpawanPosted on 2009-11-05 at 07:09:35ID: 25750236

I do that basic validation before hand. Part of my application notifications and events information will be sent to the email address given. Users doesn't want the a process like when username gets created send an email and register. So the only way that  I can think of to validate the email address that they provide  is doing this type of checking and alering the user if they fat finger the email address

 

by: sybePosted on 2009-11-05 at 07:16:11ID: 25750318

This is what I use.

Public Function IsEmail(ByVal s) As Boolean
    Dim bOk As Boolean = False
    Dim sMailAddress
    Try
        sMailAddress = New System.Net.Mail.MailAddress(s)
        bOk = True
        sMailAddress = Nothing
    Catch ex As Exception
        bOk = False     ' no success
    End Try
    Return bOk
End Function
                                              
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by: rkworldsPosted on 2009-11-05 at 07:18:00ID: 25750343

Hi

Public Function isValidEmail(ByVal inputEmail As String) As Boolean
Dim strRegex As String = ("^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}" + ("\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\" + ".)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$"))
Dim re As System.Text.RegularExpressions.Regex = New System.Text.RegularExpressions.Regex(strRegex)
If re.IsMatch(inputEmail) Then
Return True
Else
Return False
End If
End Function

 

by: sybePosted on 2009-11-05 at 07:18:54ID: 25750360

Why would you care if somebody enters a non-existing email address? There is so much that can go wrong with such stuff. What if I enter your email address, would that still be good enough for your application?

 

by: HairbrushPosted on 2009-11-05 at 07:23:37ID: 25750405

Check out http://www.codeproject.com/KB/validation/Valid_Email_Addresses.aspx which has code to validate the domain and attempt an SMTP handshake.

 

by: tgerbertPosted on 2009-11-05 at 08:20:49ID: 25751039

In most cases, the SMTP server isn't going to tell you whether or not a particular username is valid, the most they'll do is let you attempt delivery.  And in some cases you won't even get an NDR if you try using a bad e-mail address.

The only way to do what you're asking is, in your code, to generate some unique key and send an e-mail with that key to the address the user entered, then prompt them for the key they received in the e-mail.  Will that work for you?  I don't know if there's any free/cheap pre-written ASP.Net stuff that'll do that, but Google might turn up something.

20120131-EE-VQP-002

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