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System.Net.Mail and SSL

Hi all
I am having trouble with sending email via a C#2.0 application, I use
the same settings as I use in Outlook but I cannot get email to send.

I am trying to use SSL on port 465 and get the error below, If I disable
SSL and use port 587 all goes well.
I have been Googling for 2 days without success and this seems to be a
common problem.
Any help is appreciated.

Thanks.
Here is the code I am using.
MailMessage message = new MailMessage();
message.From = new MailAddress("my *******@mydomai n.com");
message.Sender = new MailAddress("my *******@mydomai n.com");
message.To.Add( new MailAddress("my *******@mydomai n.com"));
message.Subject = "This is my subject";
message.Body = "This is the content";

SmtpClient smtpClient = new SmtpClient("smt p.bizmail.yahoo .com", 465);
System.Net.Netw orkCredential mc = new
System.Net.Netw orkCredential(" my********@mydo main.com", "mypassword ");

smtpClient.UseD efaultCredentia ls = false;
smtpClient.Cred entials = mc ;
smtpClient.Deli veryMethod = SmtpDeliveryMet hod.Network ;
smtpClient.Enab leSsl = true;

try{
smtpClient.Send (message);

}
catch(Exception e) {
System.Console. WriteLine(e.Inn erException.ToS tring());
}

smtpClient = null;

Console.Write(" Press any key to continue . . . ");
Console.ReadKey (true);

The error I get is this:

Unable to read data from the transport connection: An existing
connection was forcibly closed by the remote host.

at System.Net.Sock ets.NetworkStre am.Read(Byte[] buffer, Int32
offset, Int32 size)
at System.Net.Dele gatedStream.Rea d(Byte[] buffer, Int32 offset,
Int32 count)
at System.Net.Buff eredReadStream. Read(Byte[] buffer, Int32 offset,
Int32 count)
at System.Net.Mail .SmtpReplyReade rFactory.ReadLi nes(SmtpReplyRe ader
caller, Boolean oneLine)
at System.Net.Mail .SmtpReplyReade rFactory.ReadLi ne(SmtpReplyRea der
caller)
at System.Net.Mail .SmtpReplyReade r.ReadLine()
at System.Net.Mail .SmtpConnection .GetConnection( String host, Int32 port)
at System.Net.Mail .SmtpTransport. GetConnection(S tring host, Int32 port)
at System.Net.Mail .SmtpClient.Get Connection()
at System.Net.Mail .SmtpClient.Sen d(MailMessage message)
Nov 22 '07 #1
1 3275
On Nov 22, 7:51 pm, WIzmanG <notha...@micro sft.comwrote:
Hi all
I am having trouble with sending email via a C#2.0 application, I use
the same settings as I use in Outlook but I cannot get email to send.

I am trying to use SSL on port 465 and get the error below, If I disable
SSL and use port 587 all goes well.

I have been Googling for 2 days without success and this seems to be a
common problem.

Any help is appreciated.

Thanks.

Here is the code I am using.

MailMessage message = new MailMessage();
message.From = new MailAddress("my addr...@mydomai n.com");
message.Sender = new MailAddress("my addr...@mydomai n.com");
message.To.Add( new MailAddress("my addr...@mydomai n.com"));
message.Subject = "This is my subject";
message.Body = "This is the content";

SmtpClient smtpClient = new SmtpClient("smt p.bizmail.yahoo .com", 465);
System.Net.Netw orkCredential mc = new
System.Net.Netw orkCredential(" myusern...@mydo main.com", "mypassword ");

smtpClient.UseD efaultCredentia ls = false;
smtpClient.Cred entials = mc ;
smtpClient.Deli veryMethod = SmtpDeliveryMet hod.Network ;
smtpClient.Enab leSsl = true;

try{
smtpClient.Send (message);

}

catch(Exception e) {
System.Console. WriteLine(e.Inn erException.ToS tring());

}

smtpClient = null;

Console.Write(" Press any key to continue . . . ");
Console.ReadKey (true);

The error I get is this:

Unable to read data from the transport connection: An existing
connection was forcibly closed by the remote host.

at System.Net.Sock ets.NetworkStre am.Read(Byte[] buffer, Int32
offset, Int32 size)
at System.Net.Dele gatedStream.Rea d(Byte[] buffer, Int32 offset,
Int32 count)
at System.Net.Buff eredReadStream. Read(Byte[] buffer, Int32 offset,
Int32 count)
at System.Net.Mail .SmtpReplyReade rFactory.ReadLi nes(SmtpReplyRe ader
caller, Boolean oneLine)
at System.Net.Mail .SmtpReplyReade rFactory.ReadLi ne(SmtpReplyRea der
caller)
at System.Net.Mail .SmtpReplyReade r.ReadLine()
at System.Net.Mail .SmtpConnection .GetConnection( String host, Int32 port)
at System.Net.Mail .SmtpTransport. GetConnection(S tring host, Int32 port)
at System.Net.Mail .SmtpClient.Get Connection()
at System.Net.Mail .SmtpClient.Sen d(MailMessage message)
from this distance it looks like firewalll problem, are your outlook
and c# code running on same machine ?
are your certiifcates valid ? i had similar problems using IE (instead
of outlook) the problem was certificate and nothing else, if you need
more infos mail me directly instead of newsgroup

kazazic-at-gXmXaXil.com and remove all X

regards
Nov 25 '07 #2

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