yea - that's the question.. do they? How are they related to Symantec? I know they do... but wanted to compare prices.
No.
Norton does not 'manipulate' emails in any way. The Norton programs only scan for malware if you have a POP3 email.
Yes, Norton does not provide a program per say but a digital certificate you can use to encrypt your email.
http://www.symantec.com/verisign/digital-id
You just need a s/mime client such as Outlook or Thunderbird.
This allows you to digitally sign your emails and encrypt.
In order to encrypt you and the the recipient need certificates.