Why ftp credentials are stripped away from email body when using MailMessage in C#?

I am dispatching emails at clients, notifying them for specific content deliveries and I have a problem with the containing ftp uri in mail body. I am constructing the ftp uri alongside with ftp credentials in the following format, but the credentials part is stripped away (the section user:pass@):

ftp://user:pass@server/relativepath/filename

The code is something like that:

mailTemplate += String.Format("<a href=\"{0}\">File FTP URI: {1}</a><br>",
  开发者_如何学Python  new Uri(ftpBaseLink, filename), filename);

and the email is dispatched with the following matter:

MailMessage message = new MailMessage(
    mailSettings.Smtp.From,
    mailTo,
    subject,
    mailMessage) { IsBodyHtml = true };
SmtpClient client = new SmtpClient();               
client.Send(message);

Is there any clue how can I override this "normalization"?

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I think that there was a general "tightening" of security a while back because of the way URLs containing user:pass were being mis-used to fool people into thinking they were clicking on a link to http://www.mybank.com when the link itself was http://www.mybank.com:blah@www.adodgysite.com/fake_bank_site. Users are wiser now, but it may be that its this "lockdown" that is affecting you.

My suggestion would be to concatenate the URI yourself, without using Uri

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off the top, i'd look into what 'new Uri(ftpBaseLink, filename)' becomes as a string.