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POauthentication or decryption has failed when sending mail to GMail using SSL
 

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  1. POauthentication or decryption has failed when sending mail to GMail using SSL
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    <p>I'm referring to this <a href="http://csharp.net-informations.com/communications/csharp-smtp-mail.htm" rel="noreferrer">guide on C# SMTP mail</a>.</p> <p>Here is my code:</p> <pre><code>MailMessage mail = new MailMessage(); SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com"); mail.From = new MailAddress("dave.stockinger@gmail.com"); mail.To.Add("dave.stockinger@gmail.com"); mail.Subject = "Test Mail"; mail.Body = "This is for testing SMTP mail from GMAIL"; SmtpServer.Port = 587; SmtpServer.Credentials = new System.Net.NetworkCredential("MyUserNameInGmail", "MyGmailPassWord"); SmtpServer.EnableSsl = true; SmtpServer.Send(mail); </code></pre> <p>Unfortunately, there's an exception regarding SSL and I can't fix it:</p> <blockquote> <p>Unhandled Exception: System.Net.Mail.SmtpException: Message could not be sent. ---> System.IO.IOException: The authentication or decryption has failed. ---> System.InvalidOperationException: SSL authentication error: RemoteCertificateNotAvailable, RemoteCertificateChainErrors at System.Net.Mail.SmtpClient.m__4 (System.Object sender, System.Security.Cryptography.X509Certificates.X509Certificate certificate, System.Security.Cryptography.X509Certificates.X509Chain chain, SslPolicyErrors sslPolicyErrors) [0x00000] in :0 at System.Net.Security.SslStream+c__AnonStorey7.&lt;>m__A (System.Security.Cryptography.X509Certificates.X509Certificate cert, System.Int32[] certErrors) [0x00000] in :0<br> at Mono.Security.Protocol.Tls.SslClientStream.OnRemoteCertificateValidation (System.Security.Cryptography.X509Certificates.X509Certificate certificate, System.Int32[] errors) [0x00000] in :0<br> at Mono.Security.Protocol.Tls.SslStreamBase.RaiseRemoteCertificateValidation (System.Security.Cryptography.X509Certificates.X509Certificate certificate, System.Int32[] errors) [0x00000] in :0<br> at Mono.Security.Protocol.Tls.SslClientStream.RaiseServerCertificateValidation (System.Security.Cryptography.X509Certificates.X509Certificate certificate, System.Int32[] certificateErrors) [0x00000] in :0 at Mono.Security.Protocol.Tls.Handshake.Client.TlsServerCertificate.validateCertificates (Mono.Security.X509.X509CertificateCollection certificates) [0x00000] in :0 at Mono.Security.Protocol.Tls.Handshake.Client.TlsServerCertificate.ProcessAsTls1 () [0x00000] in :0<br> at Mono.Security.Protocol.Tls.Handshake.HandshakeMessage.Process () [0x00000] in :0<br> at (wrapper remoting-invoke-with-check) Mono.Security.Protocol.Tls.Handshake.HandshakeMessage:Process () at Mono.Security.Protocol.Tls.ClientRecordProtocol.ProcessHandshakeMessage (Mono.Security.Protocol.Tls.TlsStream handMsg) [0x00000] in :0 at Mono.Security.Protocol.Tls.RecordProtocol.InternalReceiveRecordCallback (IAsyncResult asyncResult) [0x00000] in :0 --- End of inner exception stack trace --- at Mono.Security.Protocol.Tls.SslStreamBase.AsyncHandshakeCallback (IAsyncResult asyncResult) [0x00000] in :0 --- End of inner exception stack trace --- at System.Net.Mail.SmtpClient.Send (System.Net.Mail.MailMessage message) [0x00000] in :0<br> at csharpdungeon.MainClass.Main () [0x00000] in :0</p> </blockquote>
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    1. USp.campbell
    1. USDavid Stockinger
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      1. USVano Maisuradze
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      1. POauthentication or decryption has failed when sending mail to GMail using SSL
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    1. COsomeone already implemented sending via gmail (http://stackoverflow.com/questions/32260/sending-email-in-net-through-gmail)
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      1. POauthentication or decryption has failed when sending mail to GMail using SSL
      1. USAndreas Niedermair
 

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