mail sending error in asp.net with c#

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Dear Friends,

Yesterday i had sent a mail using smtp.aol.com as host succesfully.but it was gone to spam mail to my friends mail id.

the coding i used is

C#

SmtpClient smtpClient = new SmtpClient();

        MailMessage message = new MailMessage();

        try
        {

            MailAddress fromAddress = new MailAddress("sanjithbtech@aol.com", "sanjith");

            message.From = fromAddress;//here you can set address

            message.To.Add("tamilselvank@i3itpeople.com");//here you can add multiple to

            message.Subject = "Feedback";//subject of email

            message.CC.Add("cc@site.com");//ccing the same email to other email address

            message.Bcc.Add(new MailAddress("bcc@site.com"));//here you can add bcc address

            message.IsBodyHtml = false;//To determine email body is html or not

            message.Body = @"Plain or HTML Text";

            smtpClient.Send(message);

        }

        catch (Exception ex)
        {

            //throw exception here you can write code to handle exception here

        }


        System.Net.Mail.SmtpClient mailClient = new System.Net.Mail.SmtpClient();

        //This object stores the authentication values

        System.Net.NetworkCredential basicCrenntial =
             new System.Net.NetworkCredential("sanjithbtech@aol.com", "bmbitsba");

        mailClient.Host = "smtp.aol.com";

        mailClient.UseDefaultCredentials = false;

        mailClient.Credentials = basicCrenntial;

        mailClient.Send(message);
        lblStatus.Text = " Send Successfully!";

but when i sending through the same coding in the morning,it was showing the following error as

Server Error in '/' Application.
The remote certificate is invalid according to the validation procedure.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Security.Authentication.AuthenticationException: The remote certificate is invalid according to the validation procedure.

Source Error:

Line 154:        objSmtpClient.Credentials = new System.Net.NetworkCredential("sanjithbtech@aol.com", "bmbitsba");
Line 155:
Line 156:        objSmtpClient.Send(objEmail);
Line 157:
Line 158:


Source File: c:\inetpub\vhosts\cegonsoftfaq.com\httpdocs\ContactUs.aspx.cs    Line: 156

Stack Trace:

[AuthenticationException: The remote certificate is invalid according to the validation procedure.]
   System.Net.Security.SslState.StartSendAuthResetSignal(ProtocolToken message, AsyncProtocolRequest asyncRequest, Exception exception) +1646387
   System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest) +6153133
   System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest) +137
   System.Net.Security.SslState.ProcessReceivedBlob(Byte[] buffer, Int32 count, AsyncProtocolRequest asyncRequest) +53
   System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest) +120
   System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest) +85
   System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest) +61
   System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest) +137
   System.Net.Security.SslState.ProcessReceivedBlob(Byte[] buffer, Int32 count, AsyncProtocolRequest asyncRequest) +53
   System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest) +120
   System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest) +85
   System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest) +61

Whats the problem with this coding.what port i have to use.or any other solution.

Posted 10-Oct-11 20:26pm

Member 7976636

Updated 10-Oct-11 20:33pm

Mehdi Gholam

v4

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Sazzad Hossain 11-Oct-11 2:47am

i hope that's not ur actual password u pasted on ur code block :)

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dreamz9 · Answer 1 · 2011-10-10T20:36:00

Add this to your webconfig :

XML

<system.net>
        <mailSettings>
            <smtp deliveryMethod="Network" from="sanjithbtech@aol.com">
                <network host="smtp.aol.com" userName="sanjithbtech@aol.com" password="bmbitsba" port="25"/>
            </smtp>
        </mailSettings>
    </system.net>

Then Use your hotmail account in code behind :

System.Net.Mail.SmtpClient mailClient = new System.Net.Mail.SmtpClient();
 
            //This object stores the authentication values
 
            System.Net.NetworkCredential basicCrenntial =
                  new System.Net.NetworkCredential("yout hotmail email", "password");
 
            mailClient.Host = "smtp.live.com";
 
            mailClient.UseDefaultCredentials = true;
 
            mailClient.Credentials = basicCredential;
 mailClient.port=587;
            mailClient.Send(message);
            lblStatus.Text = " Send Successfully!";

Hope it work....
Good Luck :)

P.Salini · Answer 2 · 2011-10-11T01:05:00

Solution 2

Use the code in this link it will work

How to send email through asp.net[^]

Posted 11-Oct-11 1:05am

P.Salini

Anil Honey 206 · Answer 3 · 2011-10-11T01:08:00

C#

SmtpClient serverobj = new SmtpClient();
                        serverobj.Credentials = new NetworkCredential("anilmeets4u@gmail.com", "yourpassword");
                        serverobj.Port = 587;
                        serverobj.Host = "smtp.gmail.com";
                        serverobj.EnableSsl = false;
                        obj = new System.Net.Mail.MailMessage();
                        obj.From = new MailAddress("anilmeets4u@gmail.com", "AgileLearning.com", System.Text.Encoding.UTF8);

                        obj.To.Add(ds.Tables[0].Rows[i]["strEmail"].ToString());
                        obj.Priority = System.Net.Mail.MailPriority.High;
                        obj.Subject = "Regarding  TechnicalProblem";
                        string date = DateTime.Now.ToString();
                        obj.Body = "Your Technical Problem will be Rectified Within 24Hours";
                        serverobj.Send(obj);

Hope this works!

Regards,

Anilkumar.D

Sri Nivas (Vasu) · Answer 4 · 2016-01-19T03:02:00

I think this problem with SSL certificate as you are getting following error

Quote:
System.Security.Authentication.AuthenticationException: The remote certificate is invalid according to the validation procedure.

I think your problem will solved by following code.

C#

System.Net.ServicePointManager.ServerCertificateValidationCallback += 
    (s, cert, chain, sslPolicyErrors) => true;

Source is : asp.net - Security.Authentication.AuthenticationException: The remote certificate is invalid according to the validation procedure - Stack Overflow[^]

You can check following links also
.net - Could not establish trust relationship for the SSL/TLS secure channel with subject alternative name certificate - Stack Overflow[^]

The remote certificate is invalid according to the validation procedure – Server Density[^]

Hope this will help you. Good luck :)

mail sending error in asp.net with c#

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