To send SMTP e-mail, you use the 'mailto:user@host' URL format with mail messages (the receiver) in the Internet mail standard defined in RFC822. A message is sent only to the receiver identified in the argument regardless of any To:, Cc:, or Bcc: header fields in the message.
The SMTP transport supports sending mail through MX mail forwarders by redirecting messages through an SMTP smart host, normally a conventional mailing system. You can configure this using the following system-wide setting:
SstSMTPCommunications smtpSmartHost: '<smart host name>'
Below is an example of sending a message using this mechanism:
'To: Johnny <john.smith@firm.com> From: A Doit <doit@doit.org> Subject: Look at the power of SST! This was sent to you courtesy of a Smalltalk doit and SST.' sstEmailTo: 'mailto:john.smith@firm.com'
You will have to discover for yourself how to send anonymous mail.