SmtpFailedRecipientException + asp.net 2.0

[MorpheusX]

Hi

I have been having problems with smptclient in asp.net 2.0(C#). I found everytime I put a fake email address or any dodgy ones, it nevers calls SmtpFailedRecipientException in the catch statement. Any ideas why please?

This is my coding:

try
            {
                MailAddress fromAddress = new MailAddress(From, Name);
                //***You can specify the host name or ipaddress of your server
                //***Default in IIS will be localhost 
                smtpClient.Host = Host;
                //***Default port will be 25
                smtpClient.Port = Port;
                smtpClient.DeliveryMethod = smtpSec.DeliveryMethod;
                smtpClient.Credentials = CredentialCache.DefaultNetworkCredentials;
                smtpClient.UseDefaultCredentials = smtpSec.Network.DefaultCredentials;
                smtpClient.EnableSsl = false;
                //***From address will be given as a MailAddress Object
                oMsg.From = fromAddress;
                oMsg.Subject = Subject;
                //***Body can be Html or text format
                //***Specify true if it  is html message
                oMsg.IsBodyHtml = EmailBodyFormat;
                oMsg.Body = EmailBodyText;
 
 
               //***To address collection of MailAddress
              oMsg.To.Add(UsersEmail);
 
                //***Send SMTP mail
                smtpClient.Send(oMsg);
                oMsg = null;
            }
            catch(SmtpFailedRecipientException sfrex)
            {
                //***The SMTP Server is refusing to forward the Message
            }
 

Can you tell me what could be done? and any examples of coding for me resolve this issue? I have been trying various approaches for several days but to no avail, it does not go to the catch statement.

Thanks

Newbie

[Frinavale]

Hi

I have been having problems with smptclient in asp.net 2.0(C#). I found everytime I put a fake email address or any dodgy ones, it nevers calls SmtpFailedRecipientException in the catch statement. Any ideas why please?

This is my coding:

Can you tell me what could be done? and any examples of coding for me resolve this issue? I have been trying various approaches for several days but to no avail, it does not go to the catch statement.

Thanks

Newbie

Hey there!
I think the reason why it never calls the SmtpFailedRecipientException catch statement is because it may be throwing a different type of exception.

From what I understand the SmtpClient could be throwing a general SmtpException. Using this Exception you can determine what went wrong by checking the status...

See MSDN for more on the topic.

Cheers!

-Frinny

[MorpheusX]

Actually I put all the error exceptions - it nevers picks any of them including the SmtpFailedRecipientException as well.

  catch(SmtpFailedRecipientException sfrex)
            {
                //***The SMTP Server is refusing to forward the Message
            }
            catch (System.Net.Mail.SmtpException exSmtp)
            {
                //***Communication with SMTP Server Failed    
 
            }
            catch (System.Net.Sockets.SocketException exp)
            {
 
            }
            catch (System.ComponentModel.Win32Exception exp)
            {
 
            }
            catch (System.Exception exp)
            {
 
            }
 

Any ideas please..... Would really help me in an immense way.

Thanks Newbie

[Frinavale]

Actually I put all the error exceptions - it nevers picks any of them including the SmtpFailedRecipientException as well.


Any ideas please..... Would really help me in an immense way.

Thanks Newbie

The SmtpFailedRecipientException

Represents the exception that is thrown when the SmtpClient is not able to complete a Send or SendAsync operation to a particular recipient.

This means that if your SMTP server sends the email and it is never received (because it is a bogus email address), no exception happens. An exception only happens when the SmtpClient (your code) can't send to the SMTP server. When you send an email to an email address that doesn't exist, every thing's fine...the PostMaster will send you an email back saying that the message wasn't delivered but your message sent perfectly fine!

-Frinny

[MorpheusX]

I understand now what you said made sense perfectly. But what I was hoping was even if a bogus email address gets sent and recieved perfectly. Is there no way to detect the email is in fact a bogus. Cos I was hoping to trap all the bogus email address or bounced email address to an XML log.

Any ideas? I have tried TCPClient and Socket - but they are not very effective either.

Any help will be immensely appreciated.

Thanks

Newbie.

[Frinavale]

I don't know if this will help you.
But check out this thread.

-Frinny