using UnityEditor;
using UnityEngineusing UnityEditor.Build;
using UnityEditor.Build.Reporting;
using System.Diagnostics;
public class BuildHandler : IPreprocessBuildWithReport
{
    public int callbackOrder { get { return 0; } }
    public void OnPreprocessBuild(BuildReport report)
    {
        string outputPath = report.summary.outputPath;
        Process.Start(outputPath);
        Debug.Log(report.summary.result.ToString());
    }
}

using UnityEditor;
using UnityEngine;
using UnityEditor.Build;
using UnityEditor.Build.Reporting;
using System.Net;
using System.IO;
public class BuildHandler : IPreprocessBuildWithReport
{
    public int callbackOrder { get { return 0; } }
    public void OnPreprocessBuild(BuildReport report)
    {
        string outputPath = report.summary.outputPath;
        string url = "http://myserver.com/upload.php";
        WebClient client = new WebClient();
        client.UploadFile(url, outputPath);
        Debug.Log(report.summary.result.ToString());
    }
}

using UnityEditor;
using UnityEngine;
using UnityEditor.Build;
using UnityEditor.Build.Reporting;
using System.Net;
using System.Net.Mail;
public class BuildHandler : IPreprocessBuildWithReport
{
    public int callbackOrder { get { return 0; } }
    public void OnPreprocessBuild(BuildReport report)
    {
        string outputPath = report.summary.outputPath;
        string subject = "Build completed successfully!";
        string body = "The build has been completed successfully.";
        string from = "myemail@gmail.com";
        string to = "youremail@gmail.com";
        string password = "mypassword";
        SmtpClient client = new SmtpClient("smtp.gmail.com", 587);
        client.EnableSsl = true;
        client.Credentials = new NetworkCredential(from, password);
        MailMessage message = new MailMessage(from, to, subject, body);
        Attachment attachment = new Attachment(outputPath);
        message.Attachments.Add(attachment);
        client.Send(message);
        Debug.Log(report.summary.result.ToString());
    }
}

using UnityEditor;
using UnityEngine;
using UnityEditor.Build;
using UnityEditor.Build.Reporting;
using System.Net;
public class BuildHandler : IPreprocessBuildWithReport
{
    public int callbackOrder { get { return 0; } }
    public void OnPreprocessBuild(BuildReport report)
    {
        string outputPath = report.summary.outputPath;
        string ftpUrl = "ftp://myserver.com/";
        string ftpUser = "myusername";
        string ftpPassword = "mypassword";
        WebClient client = new WebClient();
        client.Credentials = new NetworkCredential(ftpUser, ftpPassword);
        client.UploadFile(ftpUrl + "build.zip", outputPath);
        Debug.Log(report.summary.result.ToString());
    }
}