Email message that includes a digital signature; can be used for sending secure emails that can only be viewed by the intended recipient; verifies that the email is from who it claims to be from and that the email has not been modified in transit
Program(s) that open p7s files
Mac: Mac OS X Mail Windows: Microsoft Outlook
Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/p7s
