ComponentPro UltimateMail

      VerifyAsync(String) Method

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      Asynchronously verifies if given email address is accepted by the server without actual submitting of the message data.

      Syntax

      public ExtendedAsyncResult<SmtpResponse> VerifyAsync(
         string toEmailAddress
      )

      Parameters

      toEmailAddress
      The email address of the recipient.

      Return Value

      An object that references the asynchronous operation.

      Examples

      Shows how to send a message using the VerifyAsync asynchronous method.

      using System;
      using System.ComponentModel;
      using ComponentPro;
      using ComponentPro.Net.Mail;
      
      ...
      
      // Create a new instance of the Smtp class.
      Smtp client = new Smtp();
      
      // Connect to the server.
      client.Connect("myserver");
      
      // Or you can specify the SMTP port with 
      // client.Connect("myserver", 25); 
       
      // Login to the server.
      client.Authenticate("user", "password");
      
      // ...
      
      SmtpResponse response = await client.VerifyAsync("john@domain.com");
      
      // ... 
       
      // Check if the recipient's mail server accept the email address. 
      if (response.Group == 2)
      {
          Console.WriteLine("Server accepts the email address");
      }
      else
      {
          Console.WriteLine("Server does accept the email address");
      }
      
      // Disconnect.
      client.Disconnect();

      Shows how to send a message using the VerifyAsync asynchronous method.

      using System;
      using System.ComponentModel;
      using ComponentPro;
      using ComponentPro.Net.Mail;
      
      ...
      
      public void DoSendAsync()
      {
          // Create a new instance of the Smtp class. 
          Smtp client = new Smtp();
      
          // Connect to the server. 
          client.Connect("myserver");
      
          // Or you can specify the SMTP port with 
          // client.Connect("myserver", 25); 
       
          // Login to the server. 
          client.Authenticate("user", "password");
      
          // ... 
       
          // Register an event handler. 
          client.VerifyCompleted += client_VerifyCompleted;
      
          client.VerifyAsync("john@domain.com");
      
          // ... 
       
          // Disconnect. 
          client.Disconnect();
      }
      
      void client_VerifyCompleted(object sender, ExtendedAsyncCompletedEventArgs<SmtpResponse> e)
      {
          // Smtp client = (Smtp)sender; 
          if (e.Error != null)
              Console.WriteLine("Error: " + e.Error.ToString());
          else 
          {
              SmtpResponse response = e.Result;
      
              // Check if the recipient's mail server accept the email address. 
              if (response.Group == 2)
              {
                  Console.WriteLine("Server accepts the email address");
              }
              else 
              {
                  Console.WriteLine("Server does accept the email address");
              }    
          }
      }

      Framework

      .NET Compact Framework.NET Compact Framework

      Supported version: 2.0, 3.5, and 3.9
      Assembly: ComponentPro.Mail.CF (in ComponentPro.Mail.CF.dll)

      .NET Framework.NET Framework

      Supported version: 2.0, 3.0, 3.5, 4.0, 4.5.x, 4.6.x and later
      Assembly: ComponentPro.Mail (in ComponentPro.Mail.dll)

      See Also