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Authentication failed error while sending mail (host : gmail)

Hi ,
Please advice on this .

Getting error while sending mail Authentication failed.

at #=zEvGFwbteQad6Bgd3tBVn6uNT3sDYoeIHb0OSNHA=.#=zitk7o2E=(String #=z4vfBkTU=, Int32 #=zbO3CvpE=)
at #=zEvGFwbteQad6Bgd3tBVn6uNT3sDYoeIHb0OSNHA=.#=zUGAYQTU=(String #=z4vfBkTU=, Int32 #=zbO3CvpE=)

Code :

{
HttpProxy proxy = new HttpProxy(“192.16.0.1”, 8888);

            using (SmtpClient client = new SmtpClient("smtp.gmail.com", 587, "xyz@gmail.com", "nagsiohschmydupg"))
            {
                client.Proxy = proxy;
                client.Send(new MailMessage(
                    "xyz@gmail.com",
                    "xyz@gmail.com",
                    "NETWORKNET-34226 - " + Guid.NewGuid().ToString(),
                    "NETWORKNET-34226 Implement socks proxy protocol for versions 4, 4a, 5 (only Username/Password authentication)"));
            }

}

@vikasaspos

Could you please share the SmtpClient activity log? Please read the following article about implementing it.
SmtpClient Activity Logging

@tahir.manzoor below is the activity logs . Please have a look

— Aspose.Email for .NET 4.0 [22.5.0.0] SMTP Client diagnostic log

— Started: 6/21/2022 11:13:32 PM

Smtp client[1|6/21/2022 11:13:34 PM]:
Smtp client[1|6/21/2022 11:13:34 PM]:
6/21/2022 11:13:34 PM

Smtp client[1|6/21/2022 11:13:34 PM]: >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Connect to: smtp.gmail.com:587 SecurityOptions.SSLExplicit <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
Smtp client[1|6/21/2022 11:13:34 PM]:
6/21/2022 11:13:34 PM

Smtp client[1|6/21/2022 11:13:34 PM]: >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Environment version: 4.0.30319.42000 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
Smtp client[1|6/21/2022 11:13:34 PM]:
6/21/2022 11:13:34 PM

Smtp client[1|6/21/2022 11:13:34 PM]: >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> OS version: Microsoft Windows NT 6.2.9200.0 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
Smtp client[1|6/21/2022 11:13:34 PM]:
6/21/2022 11:13:34 PM

Smtp client[1|6/21/2022 11:13:34 PM]: >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Assembly title: Aspose.Email for .NET 4.0 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
Smtp client[1|6/21/2022 11:13:34 PM]:
6/21/2022 11:13:34 PM

Smtp client[1|6/21/2022 11:13:34 PM]: >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Assembly version: 22.5.0.0 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
Smtp client[1|6/21/2022 11:13:34 PM]:
6/21/2022 11:13:34 PM

Smtp client[1|6/21/2022 11:13:34 PM]:
Smtp client[1|6/21/2022 11:13:34 PM]:
6/21/2022 11:13:34 PM

Smtp server[1|6/21/2022 11:13:36 PM]: 220 smtp.gmail.com ESMTP q5-20020a170902a3c500b0016a38fa3f95sm1829290plb.118 - gsmtp
Smtp server[1|6/21/2022 11:13:36 PM]:
6/21/2022 11:13:36 PM

Smtp client[1|6/21/2022 11:13:36 PM]: EHLO WIN-109OGN85ED4
Smtp client[1|6/21/2022 11:13:36 PM]:
6/21/2022 11:13:36 PM

Smtp server[1|6/21/2022 11:13:37 PM]: 250-smtp.gmail.com at your service, [14.141.226.242]
Smtp server[1|6/21/2022 11:13:37 PM]: 250-SIZE 35882577
Smtp server[1|6/21/2022 11:13:37 PM]: 250-8BITMIME
Smtp server[1|6/21/2022 11:13:37 PM]: 250-STARTTLS
Smtp server[1|6/21/2022 11:13:37 PM]: 250-ENHANCEDSTATUSCODES
Smtp server[1|6/21/2022 11:13:37 PM]: 250-PIPELINING
Smtp server[1|6/21/2022 11:13:37 PM]: 250-CHUNKING
Smtp server[1|6/21/2022 11:13:37 PM]: 250 SMTPUTF8
Smtp server[1|6/21/2022 11:13:37 PM]:
6/21/2022 11:13:37 PM

Smtp client[1|6/21/2022 11:13:37 PM]: STARTTLS
Smtp client[1|6/21/2022 11:13:37 PM]:
6/21/2022 11:13:37 PM

Smtp server[1|6/21/2022 11:13:37 PM]: 220 2.0.0 Ready to start TLS
Smtp server[1|6/21/2022 11:13:37 PM]:
6/21/2022 11:13:37 PM

Smtp client[1|6/21/2022 11:13:37 PM]: EHLO WIN-109OGN85ED4
Smtp client[1|6/21/2022 11:13:37 PM]:
6/21/2022 11:13:37 PM

Smtp client[1|6/21/2022 11:13:37 PM]:
Smtp client[1|6/21/2022 11:13:37 PM]:
6/21/2022 11:13:37 PM

Smtp client[1|6/21/2022 11:13:37 PM]: >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Connect to: smtp.gmail.com:587 SecurityOptions.None <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
Smtp client[1|6/21/2022 11:13:37 PM]:
6/21/2022 11:13:37 PM

Smtp client[1|6/21/2022 11:13:37 PM]: >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Environment version: 4.0.30319.42000 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
Smtp client[1|6/21/2022 11:13:37 PM]:
6/21/2022 11:13:37 PM

Smtp client[1|6/21/2022 11:13:37 PM]: >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> OS version: Microsoft Windows NT 6.2.9200.0 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
Smtp client[1|6/21/2022 11:13:37 PM]:
6/21/2022 11:13:37 PM

Smtp client[1|6/21/2022 11:13:37 PM]: >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Assembly title: Aspose.Email for .NET 4.0 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
Smtp client[1|6/21/2022 11:13:37 PM]:
6/21/2022 11:13:37 PM

Smtp client[1|6/21/2022 11:13:37 PM]: >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Assembly version: 22.5.0.0 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
Smtp client[1|6/21/2022 11:13:37 PM]:
6/21/2022 11:13:37 PM

Smtp client[1|6/21/2022 11:13:37 PM]:
Smtp client[1|6/21/2022 11:13:37 PM]:
6/21/2022 11:13:37 PM

Smtp server[1|6/21/2022 11:13:37 PM]: 220 smtp.gmail.com ESMTP y6-20020a056a00180600b0051c147eee7bsm11779389pfa.110 - gsmtp
Smtp server[1|6/21/2022 11:13:37 PM]:
6/21/2022 11:13:37 PM

Smtp client[1|6/21/2022 11:13:37 PM]: EHLO WIN-109OGN85ED4
Smtp client[1|6/21/2022 11:13:37 PM]:
6/21/2022 11:13:37 PM

Smtp server[1|6/21/2022 11:13:37 PM]: 250-smtp.gmail.com at your service, [14.141.226.242]
Smtp server[1|6/21/2022 11:13:37 PM]: 250-SIZE 35882577
Smtp server[1|6/21/2022 11:13:37 PM]: 250-8BITMIME
Smtp server[1|6/21/2022 11:13:37 PM]: 250-STARTTLS
Smtp server[1|6/21/2022 11:13:37 PM]: 250-ENHANCEDSTATUSCODES
Smtp server[1|6/21/2022 11:13:37 PM]: 250-PIPELINING
Smtp server[1|6/21/2022 11:13:37 PM]: 250-CHUNKING
Smtp server[1|6/21/2022 11:13:37 PM]: 250 SMTPUTF8
Smtp server[1|6/21/2022 11:13:37 PM]:
6/21/2022 11:13:37 PM

@vikasaspos

We have logged this problem in our issue tracking system as EMAILNET-40627. You will be notified via this forum thread once this issue is resolved.

We apologize for your inconvenience.

@tahir.manzoor
I have tried below code as well . But got error “Unable to write data to the transport connection: An established connection was aborted by the software in your host machine.”

SmtpClient client = new SmtpClient(“smtp.gmail.com”, 587, “xtz@gmail.com”, “gdjsjhgdgsds”);
client.SecurityOptions = SecurityOptions.SSLImplicit;
string proxyAddress = “172.16.0.1”; // proxy address
int proxyPort = 3128; // proxy port
SocksProxy proxy = new SocksProxy(proxyAddress, proxyPort, SocksVersion.SocksV5);
client.Proxy = proxy;

            client.Send(new MailMessage("xyz@gmail.com", "xyz@gmail.com", "Sending Email via proxy", "Implement socks proxy protocol for versions 4, 4a, 5 (only Username/Password authentication)"));

@vikasaspos

Your issue has been logged for investigation. We will investigate the issue and provide you more information on it. Thanks for your patience.