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Assunto : .NET
Titulo: Verificando se o domínio de um e-mail existe

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Uma boa forma de evitar cadastramentos com e-mail falso é verificar se o domínio de um determinado endereço de e-mail realmente existe.

Para fazer isso devemos realizar a resolução do nome DNS do servidor de domínio. Se encontrarmos como resposta um endereço IP, o domínio existe, se tivermos um erro como resposta então o servidor de domínio certamente não é válido.

No ASP.NET pode-se, por exemplo, usar um CustomValidator para realizar a validação de endereços de correio. Veja como fica o código de validação :

Dim dominio As String
Dim obj As Net.IPHostEntry
dominio = TextBox1.Text.Substring(TextBox1.Text.IndexOf("@") + 1)
obj = Net.Dns.Resolve(dominio)
Label1.Text = obj.AddressList(0).ToString
Catch er As Exception
args.isvalid = False
'ou, para aplicações windows
'msgbox("Domínio inválido!")
End Try

Como podem notar, tarefas que antes eram muito dificeis de serem realizadas, tal como uma resolução DNS via código, com o Framework .NET se tornaram muito simples.

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