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How to send mail to an exchange email using smtp in asp.net?

Posted on 2009-07-06
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Last Modified: 2013-11-30
Hi, i'm trying to send an email through smtp client in asp.net. It's ending with an error saying "Failure sending mail" and having inner exception as "Unable to read data from the transport connection: net_io_connectionclosed". I've tried surfing google to get this resolved and found few smtp.ServicePoint parameters to be setup but all that didn't work.

What i've come to know from my client is that the Mail Service is acquired from "networkdogsinc.com" and the mail address is an Exchange email. So far i've worked simple mail servers in asp.net and has developed working solutions but with Exchange Server it's my first experience. Also i didn't know how to access the "mail.combslawgroup.com" directly other than code or any mailing tool like outlook.

Please review the code attached for reference. Note that the From and To email address is same in this case (because this is for a Contact us page). Also the SMTPUid and SMTPPwd parameters in real code.

Please any one there to help me to get this resolved as it's a problem on one of my live sites.

Regards.
try
                {
                    MailMessage email = new MailMessage();
 
                    email.From = new MailAddress("mail@server.com");
                    email.To.Add("mail@server.com");
                    email.Subject = "Contact Us Email Subject";
                    email.Body = "email body";
 
                    SmtpClient smtp = new SmtpClient("mail.combslawgroup.com");
                    smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
                    smtp.ServicePoint.MaxIdleTime = 1000;
                    smtp.ServicePoint.ConnectionLimit = 1;
                    email.IsBodyHtml = true;
                    smtp.UseDefaultCredentials = true;
                    smtp.Credentials = new System.Net.NetworkCredential("SMTPUid", "SMTPPwd");
                    smtp.Send(email);
 
                    return "Your request has been submitted successfully.";
                }
                catch (Exception ex)
                {
                    return "An error occured while sending email to admin. Error :: " + ex.Message;
                }

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Question by:23-degrees
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florin_s earned 250 total points
ID: 24784225
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Author Comment

by:23-degrees
ID: 24784511
Thanks for the reply but the links provided targets asp classic based code where as i need any resource for ASP.Net. Can you spell any example with asp.net code that would be sending mail to an exchange mailbox?
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by:florin_s
ID: 24784624
let me search a bit more, I'm not that good in writing code
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Expert Comment

by:LeeDerbyshire
ID: 24795315
Have you configured Exchange to allow the computer that this code is running on (even if it's on the Exchange server itself) to relay messages through it?
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Author Comment

by:23-degrees
ID: 24796109
I'm not new to exchange server. Can you please let me know how to set up the exchange so as it may allow relaying if it is hosted by a hosting company?
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by:LeeDerbyshire
ID: 24796189
Which version of Exchange?
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