problem in send gmail with asp

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i write this code for send gmail with asp.net 4
but this code has a problem

where is problem?

C#

////my message setting
MailMessage msg = new MailMessage();
msg.From = new MailAddress("gsadegh.rusta@gmail.com");
msg.To.Add("sadegh_rusta@yahoo.com");
msg.Body = "body my mail";
msg.Subject = "my mail subject";
msg.Priority = MailPriority.High;

SmtpClient client = new SmtpClient();
client.Credentials = new NetworkCredential("gsadegh.rusta@gmail.com", "gsadeghrusta", "smtp.gmail.com");
client.Host = "smtp.gmail.com";
client.Port = 587;
client.DeliveryMethod = SmtpDeliveryMethod.Network;
client.EnableSsl = false;
client.UseDefaultCredentials =true;

client.Send(msg);

error is:

The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required. Learn more at
or:
The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 Must issue a STARTTLS command first. v51sm5742961eef.2

i do test with ports:25 and 465

Posted 8-Mar-12 1:37am

sadegh_rusta

Updated 8-Mar-12 1:38am

Ganesan Senthilvel

v2

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4 solutions

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Ganesan Senthilvel · Answer 1 · 2012-03-08T01:45:00

Couple of suggestion. Set UseDefaultCredentials attribute before instantiating NetworkCredential. Your code will be re ordered as:

C#

SmtpClient client = new SmtpClient();
client.UseDefaultCredentials =true;
client.Credentials = new NetworkCredential("gsadegh.rusta@gmail.com", "gsadeghrusta", "smtp.gmail.com");
client.Host = "smtp.gmail.com";
client.Port = 587;
client.DeliveryMethod = SmtpDeliveryMethod.Network;
client.EnableSsl = false;

client.Send(msg);

Ganesan Senthilvel · Answer 2 · 2012-03-08T01:48:00

Solution 2

Another idea is:

After enabling POP or IMAP on your Gmail account, there is no matching enableSsl setting and so config file will be:

XML

<system.net>
  <mailSettings>
    <smtp from="myusername@gmail.com" deliveryMethod="Network">
      <network defaultCredentials="false" enableSsl="true" host="smtp.gmail.com" port="587" password="password" userName="myusername@gmail.com"/>
    </smtp>
  </mailSettings>
</system.net>

Posted 8-Mar-12 1:48am

Ganesan Senthilvel

Comments

sadegh_rusta 8-Mar-12 8:02am

i do it but has error
errror is :
The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required. Learn more at

sadegh_rusta · Answer 3 · 2012-03-08T03:55:00

Solution 5

i have this error now
Failure send email

Posted 8-Mar-12 3:55am

sadegh_rusta

Comments

Richard MacCutchan 8-Mar-12 11:40am

Please stop posting questions and replies as solutions. Use the "Have a Question or Comment" link, or the "Reply" link on specific messages. And try to do some sensible debugging for yourself; the above comment is totally meaningless as we do not know the context of where or how it appears.

sravani.v · Answer 4 · 2012-03-08T22:35:00

Try this code

C#

public int SendUserMail(string fromad, string toad, string body, string header, string subjectcontent)
   {
       int result = 0;
       MailMessage usermail = Mailbodplain(fromad, toad, body, header, subjectcontent);
       SmtpClient client = new SmtpClient();
       //Add the Creddentials- use your own email id and password
       client.Credentials = new System.Net.NetworkCredential("your user id ", "pwd"); ;

       client.Host = "smtp.gmail.com";
       client.Port = 587;
       client.EnableSsl = true;
       try
       {
           client.Send(usermail);
           result = 1;
       }
       catch (Exception ex)
       {
           result = 0;
       } // end try

       return result;

   }
   public MailMessage Mailbodplain(string fromad, string toad, string body, string header, string subjectcontent)
   {
       System.Net.Mail.MailMessage mail = new System.Net.Mail.MailMessage();
       try
       {
           string from = fromad;
           string to = toad;
           mail.To.Add(to);
           mail.From = new MailAddress(from, header, System.Text.Encoding.UTF8);
           mail.Subject = subjectcontent;
           mail.SubjectEncoding = System.Text.Encoding.UTF8;
           mail.Body = body;
           mail.BodyEncoding = System.Text.Encoding.UTF8;
           mail.IsBodyHtml = true;
           mail.Priority = MailPriority.High;
       }
       catch (Exception ex)
       {
           throw;
       }
       return mail;
   }

problem in send gmail with asp

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