.NET Sending email error

Question

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hi, i am trying to send an email through my application, but it gives me an exception. Email sending failure. Inner exception "Unable to connect to the remote server".

this problem comes for my domain as well as when i try to use gmail smtp settings.

C#

string ReplyTo = "From@mydomain.com";
                SmtpClient client = new SmtpClient("localhost"); 
                MailAddress from = new MailAddress("From@mydomain.com", "Hello"); 
                MailAddress to = new MailAddress("To@mydomain.com");
                MailMessage message = new MailMessage(from, to);
                client.Credentials = new System.Net.NetworkCredential("MYID", "PASSWORD");
                
                message.Body = Body;
                message.Subject = Subject;

                StringBuilder str = new StringBuilder();
                str.AppendLine("Hello this is a test email");StringBuilder str = new StringBuilder();
                str.AppendLine("BEGIN:VCALENDAR");
                str.AppendLine("PRODID:-//HR21");
                str.AppendLine("VERSION:2.0");
                str.AppendLine("METHOD:PUBLISH");
                str.AppendLine("BEGIN:VEVENT");
                str.AppendLine(string.Format("DTSTART:{0:yyyyMMddTHHmmssZ}", FromDate.ToUniversalTime()));
                str.AppendLine(string.Format("DTSTAMP:{0:yyyyMMddTHHmmssZ}", DateTime.Now.ToUniversalTime()));
                str.AppendLine(string.Format("DTEND:{0:yyyyMMddTHHmmssZ}", ToDate.ToUniversalTime()));
                str.AppendLine("LOCATION: None");
                str.AppendLine(string.Format("UID:{0}", Guid.NewGuid()));
                str.AppendLine(string.Format("DESCRIPTION:{0}", message.Body));
                str.AppendLine(string.Format("X-ALT-DESC;FMTTYPE=text/html:{0}", message.Body));
                str.AppendLine(string.Format("SUMMARY:{0}", message.Subject));
                str.AppendLine(string.Format("ORGANIZER:MAILTO:{0}", message.From.Address));

                str.AppendLine(string.Format("ATTENDEE;CN=\"{0}\";PARTSTAT=ACCEPTED:mailto:{1}", message.To[0].DisplayName, message.To[0].Address));

                str.AppendLine("BEGIN:VALARM");
                str.AppendLine("TRIGGER:-PT15M");
                str.AppendLine("ACTION:DISPLAY");
                str.AppendLine("DESCRIPTION:Reminder");
                str.AppendLine("END:VALARM");
                str.AppendLine("END:VEVENT");
                str.AppendLine("END:VCALENDAR");

                System.Net.Mime.ContentType ct = new System.Net.Mime.ContentType("text/calendar");
                ct.Parameters.Add("method", "PUBLISH");
                AlternateView avCal = AlternateView.CreateAlternateViewFromString("abc", ct);

                message.AlternateViews.Add(avCal);
             
                client.Send(message);

Posted 3-Dec-13 10:58am

Adeel Ijaz

Updated 3-Dec-13 21:16pm

Pheonyx

v2

Add a Solution

5 solutions

Solution 1

You cannot send an email as "localhost" as your SMTP client. That has to be legitimate in order for an email to be sent.

Posted 3-Dec-13 11:02am

Richard C Bishop

Comments

Adeel Ijaz 3-Dec-13 17:36pm

i am using ip actually 10.10.0.45

Adeel Ijaz 3-Dec-13 17:37pm

in the smtpclient.credentials i am not passing my actual userid and password, instead i am passing hard coded string "UserId" , "Password". Is it because of this ?

Solution 5

C#

System.Net.Mail.MailMessage meg = new System.Net.Mail.MailMessage();
System.Net.Mail.SmtpClient mailsender = new System.Net.Mail.SmtpClient();


try {
    string su ="Your Message" 

    string attachfilepath = "";
    //apppath get path for file
    if (File.Exists(apppath + "\\ErrorLogs.txt") == true) {
        attachfilepath = apppath + "\\ErrorLogs.txt";
    } else if (File.Exists(apppath + "\\ErrorLogs.txt") == true) {
        attachfilepath = apppath + "\\ErrorLogs.txt";
    }

    Attachment atm = new Attachment(attachfilepath);

    meg.From = new MailAddress("From Address", "SendeName");
    // Email address of the sender and Display name(optional)

    meg.To.Add("sample@gmail.com");
    //To address

    meg.CC.Add("sample@gmail.com");
    //Cc
    meg.Bcc.Add("sample@gmail.com");
    //Bcc
    meg.Subject = "This is text mail";
    // Email subject
    meg.Body = su;
    //Email body i.e. the content of the email
    meg.IsBodyHtml = true;
    meg.Attachments.Add(atm);
    //Attachment

    Configuration configurationFile = WebConfigurationManager.OpenWebConfiguration(HttpContext.Current.Request.ApplicationPath + "/web.config");
    MailSettingsSectionGroup mailSettings = configurationFile.GetSectionGroup("system.net/mailSettings");

    if (mailSettings != null) {
        mailsender.Host = mailSettings.Smtp.Network.Host;
        mailsender.Port = mailSettings.Smtp.Network.Port;
        if (Convert.ToBoolean(mailSettings.Smtp.Network.DefaultCredentials)) {
            mailsender.UseDefaultCredentials = true;
        }
        if (Convert.ToBoolean(mailSettings.Smtp.Network.EnableSsl)) {
            mailsender.EnableSsl = true;
        }
        mailsender.Credentials = new System.Net.NetworkCredential(mailSettings.Smtp.Network.UserName, mailSettings.Smtp.Network.Password);
    }
    mailsender.Send(meg);
} catch (Exception ex) {
    ShowMessage(ex.Message);

} finally {
    ShowMessage("Mail Successfully send");

}

SQL

for best coding try to give email address and password in web.config file
here the code for web.config

XML

<pre lang="xml">    <system.net>
        <mailSettings>
            <smtp>

                <network defaultCredentials="true" host="smtp.gmail.com" password="password" port="587" userName="emailaddress" enableSsl="true"/>
            </smtp>
        </mailSettings>
        <settings>
            <httpWebRequest useUnsafeHeaderParsing="true"/>
        </settings>
    </system.net></pre>

try to change port 465 to 587

Posted 3-Dec-13 20:06pm

Aravindba

Updated 3-Dec-13 20:14pm

v5

Solution 4

Use code in web.config for this email configuration.

Posted 3-Dec-13 19:43pm

C@dER@j

Solution 6

C#

SmtpClient client = new SmtpClient("localhost");

Replace localhost with correct IP.

C#

client.Credentials = new System.Net.NetworkCredential("MYID", "PASSWORD");

Provide correct UserID and Password instead of "MYID" and "PASSWORD".

Posted 3-Dec-13 20:33pm

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

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Sergey Alexandrovich Kryukov · Accepted Answer · 2013-12-03T11:02:00

Solution 2

It has nothing to do with anything in your code except SmtpClient client = new SmtpClient("localhost");. It assumes that you are running SMTP server on your local host. I doubt you do. This parameter should be the host computer name or IP address of the host running some SMTP service.

—SA

Posted 3-Dec-13 11:02am

Sergey Alexandrovich Kryukov

Comments

Adeel Ijaz 3-Dec-13 17:28pm

I am using Ip address = "10.10.0.45"

Sergey Alexandrovich Kryukov 3-Dec-13 17:43pm

And..?!
—SA

Adeel Ijaz 3-Dec-13 17:29pm

in the smtpclient.credentials i am not passing my actual userid and password, instead i am passing hard coded string "UserId" , "Password". Is it because of this ?

Sergey Alexandrovich Kryukov 3-Dec-13 17:43pm

It depends on the SMPT server. Do you really use the server on local host?
—SA

Adeel Ijaz 3-Dec-13 17:44pm

No, but i am testing the application. Actual would be the customer's server.

Sergey Alexandrovich Kryukov 3-Dec-13 17:50pm

Then use some server! You cannot "test" working on the server which does not exist.
—SA

Adeel Ijaz 3-Dec-13 18:12pm

i have tried using gmail as the server i meam , smtp.gmail.com and port 465 giving my email + password.

and the code still generates the same exception.

failure sending email. Unable to connect to remote server

Sergey Alexandrovich Kryukov 3-Dec-13 18:27pm

Well, test the server with some available mail client, check up if you got valid account, username/password. Look, this is already not programming...
—SA