The main threat of an Email
StealthMail uses Email to send only Stealth-Links that do not contain any user information whatsoever. Only through Stealth-Links can an authorized user access encrypted Email content and attachments.
Thus, untrusted 3rd party mail servers will only receive and transfer Stealth-Links, which can't be decrypted as they do not contain data. This approach to protecting Emails makes SMTP, SSL/TLS vulnerabilities complete non-issues.