To judge whether really exist in SMTP mailbox

smtp认证
........\WindowsFormsApplication7
........\WindowsFormsApplication7.sln
........\WindowsFormsApplication7.suo
........\........................\bin
........\........................\...\Debug
........\........................\...\.....\EncryptDecryptDLL.dll
........\........................\...\.....\WindowsFormsApplication7.exe
........\........................\...\.....\WindowsFormsApplication7.pdb
........\........................\...\.....\WindowsFormsApplication7.vshost.exe
........\........................\...\.....\WindowsFormsApplication7.vshost.exe.manifest
........\........................\Form1.cs
........\........................\Form1.Designer.cs
........\........................\Form1.resx
........\........................\KSN_Smtp.cs
........\........................\MailMessage.cs
........\........................\obj
........\........................\...\x86
........\........................\...\...\Debug
........\........................\...\...\.....\DesignTimeResolveAssemblyReferences.cache
........\........................\...\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
........\........................\...\...\.....\GenerateResource.read.1.tlog
........\........................\...\...\.....\GenerateResource.write.1.tlog
........\........................\...\...\.....\ResolveAssemblyReference.cache
........\........................\...\...\.....\TempPE
........\........................\...\...\.....\WindowsFormsApplication7.csproj.FileListAbsolute.txt
........\........................\...\...\.....\WindowsFormsApplication7.exe
........\........................\...\...\.....\WindowsFormsApplication7.Form1.resources
........\........................\...\...\.....\WindowsFormsApplication7.pdb
........\........................\...\...\.....\WindowsFormsApplication7.Properties.Resources.resources
........\........................\Program.cs
........\........................\Properties
........\........................\..........\AssemblyInfo.cs
........\........................\..........\Resources.Designer.cs
........\........................\..........\Resources.resx
........\........................\..........\Settings.Designer.cs
........\........................\..........\Settings.settings
........\........................\WindowsFormsApplication7.csproj

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