How To send Email with C# on Unity 3D 4.1.2?

Question

first I came across this article:

I got few errors and I start searching:

but I just cannot figure out how to solve this:

 using UnityEngine;
 using System.Net;
 using System.Net.Mail;
 using System.Collections;
 
 public class SendEmail : MonoBehaviour {
     void Start () {
         Debug.Log("asdgf");
         SendEmailF();
         
     }
     private void SendEmailF(){
         // Create a System.Net.Mail.MailMessage object
         MailMessage message = new MailMessage();
         
         // Add a recipient
         message.To.Add("Reciver.Email@gmail.com");
         
         // Add a message subject
         message.Subject = "Test Email Subject message";
         
         // Add a message body
         message.Body = "Test email Body message.";
         
         // Create a System.Net.Mail.MailAddress object and 
         // set the sender email address and display name.
         message.From = new MailAddress("Sender.Email@gmail.com", "John Smith");
         
         // Create a System.Net.Mail.SmtpClient object
         // and set the SMTP host and port number
         SmtpClient smtp = new SmtpClient("smtp.gmail.com", 587);
         
         // If your server requires authentication add the below code
         // =========================================================
         // Enable Secure Socket Layer (SSL) for connection encryption
         smtp.EnableSsl = true;
         
         // Do not send the DefaultCredentials with requests
         smtp.UseDefaultCredentials = false;
         
         // Create a System.Net.NetworkCredential object and set
         // the username and password required by your SMTP account

1.try

 //        smtp.Credentials = new NetworkCredential("Sender.Email@gmail.com", "Password");
                 // Assets/SendEmail.cs(43,22): error CS0266: Cannot implicitly convert type `System.Net.NetworkCredential' to `System.Net.ICredentialsByHost'. An explicit conversion exists (are you missing a cast?)

2.try

 //        smtp.Credentials = (ICredentialsByHost) new NetworkCredential("Sender.Email@gmail.com", "Password");
                 // wow no error but when I run the code:
                 // InvalidOperationException: SSL authentication error: RemoteCertificateNotAvailable, RemoteCertificateChainErrors
                 // System.Net.Mail.SmtpClient.<callback>m__4 (System.Object sender, System.Security.Cryptography.X509Certificates.X509Certificate certificate, System.Security.Cryptography.X509Certificates.X509Chain chain, SslPolicyErrors sslPolicyErrors)
                 // System.Net.Security.SslStream+<BeginAuthenticateAsClient>c__AnonStorey7.<>m__A (System.Security.Cryptography.X509Certificates.X509Certificate cert, System.Int32[] certErrors)
                 // Mono.Security.Protocol.Tls.SslClientStream.OnRemoteCertificateValidation (System.Security.Cryptography.X509Certificates.X509Certificate certificate, System.Int32[] errors)
                 // Mono.Security.Protocol.Tls.SslStreamBase.RaiseRemoteCertificateValidation (System.Security.Cryptography.X509Certificates.X509Certificate certificate, System.Int32[] errors)
                 // Mono.Security.Protocol.Tls.SslClientStream.RaiseServerCertificateValidation (System.Security.Cryptography.X509Certificates.X509Certificate certificate, System.Int32[] certificateErrors)
                 // Mono.Security.Protocol.Tls.Handshake.Client.TlsServerCertificate.validateCertificates (Mono.Security.X509.X509CertificateCollection certificates)
                 // Mono.Security.Protocol.Tls.Handshake.Client.TlsServerCertificate.ProcessAsTls1 ()
                 // Mono.Security.Protocol.Tls.Handshake.HandshakeMessage.Process ()
                 // (wrapper remoting-invoke-with-check) Mono.Security.Protocol.Tls.Handshake.HandshakeMessage:Process ()
                 // Mono.Security.Protocol.Tls.ClientRecordProtocol.ProcessHandshakeMessage (Mono.Security.Protocol.Tls.TlsStream handMsg)
                 // Mono.Security.Protocol.Tls.RecordProtocol.InternalReceiveRecordCallback (IAsyncResult asyncResult)
                 // Rethrow as IOException: The authentication or decryption has failed.
                 // Mono.Security.Protocol.Tls.SslStreamBase.AsyncHandshakeCallback (IAsyncResult asyncResult)
                 // Rethrow as SmtpException: Message could not be sent.
                 // System.Net.Mail.SmtpClient.Send (System.Net.Mail.MailMessage message)
                 // SendEmail.SendEmailF () (at Assets/SendEmail.cs:59)
                 // SendEmail.Start () (at Assets/SendEmail.cs:9)

3.try

 //        NetworkCredential myCred = new NetworkCredential("Sender.Email@gmail.com","Password");
 //        
 //        CredentialCache myCache = new CredentialCache();
 //        
 //        myCache.Add(new Uri("www.contoso.com"), "Basic", myCred);
 //        
 //        WebRequest wr = WebRequest.Create("www.contoso.com");
 //        smtp.Credentials = myCache;
                 // Assets/SendEmail.cs(69,33): error CS0246: The type or namespace name `Uri' could not be found. Are you missing a using directive or an assembly reference?
                 // Assets/SendEmail.cs(69,25): error CS1502: The best overloaded method match for `System.Net.CredentialCache.Add(System.Uri, string, System.Net.NetworkCredential)' has some invalid arguments
                 // Assets/SendEmail.cs(69,25): error CS1503: Argument `#1' cannot convert `object' expression to type `System.Uri'

the rest of the code

         // =========================================================
         
         // Send the message
         smtp.Send(message);
     }
 }

it's all in 1 BIG script but I only uncomment a line after 1,2,3 try and get an error that's commented

I made it like this to look a little bit more organized

and I'm using Unity 3D 4.1.2

Answer 1

Best Answer

Answer by ByteSheep · Apr 08, 2013 at 11:29 AM

Adapted from http://stackoverflow.com/questions/4148019/authentication-or-decryption-has-failed-when-sending-mail-to-gmail-using-ssl

 using UnityEngine;
 using System.Collections;
 using System;
 using System.Net;
 using System.Net.Mail;
 using System.Net.Security;
 using System.Security.Cryptography.X509Certificates;
 
 public class mono_gmail : MonoBehaviour {
 
         void Main ()
         {
             MailMessage mail = new MailMessage();
 
             mail.From = new MailAddress("youraddress@gmail.com");
             mail.To.Add("youraddress@gmail.com");
             mail.Subject = "Test Mail";
             mail.Body = "This is for testing SMTP mail from GMAIL";
 
             SmtpClient smtpServer = new SmtpClient("smtp.gmail.com");
             smtpServer.Port = 587;
             smtpServer.Credentials = new System.Net.NetworkCredential("youraddress@gmail.com", "yourpassword") as ICredentialsByHost;
             smtpServer.EnableSsl = true;
             ServicePointManager.ServerCertificateValidationCallback = 
                 delegate(object s, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors) 
                     { return true; };
             smtpServer.Send(mail);
             Debug.Log("success");
         
         }
 }

This will send an email to a gmail account. Create a c# file in unity and name it 'mono_gmail'.
Don't forget to replace the email address with your own and of course add your password :)

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Richard 3 · Apr 25, 2013 at 11:25 AM 0

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Sweet Thanks, work perfectly!

sdgd · Apr 27, 2013 at 12:21 AM 0

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yeah I think not only the answer deserves lots of thumbs up as he did try figuering out about 3 days iirc but even the Q as there's only old and not accurate any longer threads and Questions for how to send Email :)

girishgowdayt · Jun 12, 2013 at 12:35 PM 0

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Thank you very much for the code.. it saved my 1 day..

Richard 3 · Oct 09, 2013 at 11:57 AM 2

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Got IT! I found out I had to set Api Compatibility Level to ".NET 2.0" ins$$anonymous$$d of ".NET 2.0 Subset" under player settings. Works great!!!

JuanMaldonado · Nov 08, 2016 at 07:47 PM 1

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For Standalone Builds, remember to change the API Compatibility Level in PlayerSettings/OtherSettings to .NET 2.0 not .NET 2.0 Subset.

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Answer 2

Answer by gooongalooo · Jul 04, 2015 at 05:56 PM

Better use

 client.SendAsync(message , "");

especially if you want to send some more stuff like attachments and so in ;) https://msdn.microsoft.com/de-de/library/x5x13z6h%28v=vs.110%29.aspx

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Answer 3

Answer by jeryymanly · Jan 20, 2014 at 07:54 AM

A simple smtp email

             mail.From = new MailAddress("your_email_address@gmail.com");
             mail.To.Add("to_address");
             mail.Subject = "Test Mail";
             mail.Body = "This is for testing SMTP mail from GMAIL";

             SmtpServer.Port = 587;
             SmtpServer.Credentials = new System.Net.NetworkCredential("username", "password");
             SmtpServer.EnableSsl = true;

source: http://csharp.net-informations.com/communications/csharp-smtp-mail.htm c# smtp

jery

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isteffy · Feb 18, 2017 at 08:05 PM 0

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Great code. Great link. Thank you

Answer 4

Answer by Falcon_DZ · Feb 25, 2016 at 07:58 AM

the above code by # merry_christmas works in standalone as well as in editor but it doesn't have any effect when build on webGL. can anyone tell what change has to be done to make it work? Thanks.

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fmathews34 · Jul 11, 2016 at 07:30 PM 0

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for some reason my project wont even load after i build it in webGL with this script included and the project crashes anytime i try to run the script even in the editor.

Answer 5

Answer by Yuriy-Ivanov · Jun 18, 2017 at 06:32 PM

Unfortunately, Unity uses an outdated and buggy Mono 2.0 SmtpClient, which doesn't fully support STARTTLS protocol used my many modern SMTP servers. We've recently published a new asset UTMail - Email Composition and Sending Plugin, which doesn't have that issue and so works well with most SMTP servers (we've tested it with number of popular ones). It also allows not only directly sending emails with SMTP, but also composing emails using a system email client, with a content defined by your app. It works on multiple platforms and supports attachments and HTML / text messages.

Best regards,

Yuriy, Universal Tools team.

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tanoshimi · Jun 18, 2017 at 07:37 PM 0

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Please don't revive posts that were already answered over 4 years ago just to promote your new asset.

khemistry · Oct 10, 2017 at 04:26 AM 1

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This page still comes up on google really easily, and this response explained to me why the old answer wasn't working for me.

And the tool they are offering is exactly what I needed.

How To send Email with C# on Unity 3D 4.1.2?

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