Set Email Attachment name in C# with System.Web.Mail

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C#3.5

email

I cannot use System.Net.Mail because I must connect with Servers that use Implicit SSL but System.Net.Mail does not support it.

Therefore I am forsed to use the old deprecated library too

I add an attachment like this:

System.Web.Mail.MailAttachment attachment = new System.Web.Mail.MailAttachment(AttachmentPath);

System.Web.Mail.MailMessage mailMsg = new System.Web.Mail.MailMessage();
....
mailMsg.Attachments.Add(attachment);

But I want to make it attach as a different name:
the actual file name is very long and confusing because it is a temporary file.
I would like it to attach such as "SalesOrderNo1.pdf",
is there a way to do this without having to make a copy of the file with high risk of file name collision ?

I know that System.Net.Mail.Attachment has property Name to set attachment title.
Instead System.Web.Mail.MailAttachment only has a readonly property Filename returns loaded file path.

Thanks