first, i've discovered through trial and error that c# 4/.NET 4 has some serious limitations which are to me unexplainable.
Microsoft is not supporting SSL over port 465 in c# 4/.NET 4.
Microsoft only supports SSL on 587 through "STARTTLS".
i need to use 465/SSL because my mail server hMailServer does not support "STARTTLS".
i had hoped to use c# 4/.NET 4 out of the box ... i do not want to purchase any third party solutions.
what i would like to do is to craft my own solution for SMTP using SSL on port 465.
i'm guessing that i may have to use c# unmanaged code to make this happen.
any ideas?, please & thank you. rgds/gerry
References:
"configuring SSL confusion...", hMailServer forum thread.
MSDN: "SmtpClient.EnableSsl Property":
"An alternate connection method is where an SSL session is established up front before any protocol commands are sent. This connection method is sometimes called SMTP/SSL, SMTP over SSL, or SMTPS and by default uses port 465. This alternate connection method using SSL is not currently supported."
P.S.: i searched SO and Google and can find nothing directly relevant.
f you can, and if it still works ("This API is now obsolete"), you should be able to use SMTPS (SMTP with up-front SSL/TLS) using System.Web.Mail.MailMessage:
System.Web.Mail.MailMessage mailMsg = new System.Web.Mail.MailMessage();
// ...
mailMsg.Fields.Add
("http://schemas.microsoft.com/cdo/configuration/smtpusessl",
true);
Of course, the fact that this API is now obsolete in .Net 4 is not ideal. It probably still works in practice.
Failing that, you may have to rely on 3rd-part libraries or something like stunnel.