Jamrock wrote: <snip>
A colleague says that Lotus Notes gets around this by using a proprietory digital signature. You can't even open up the client software without a username and a password. I haven't verified this for myself.
Yes but then you would have to use Lotus Notes which is a much worse proposition then having to deal with the possibility of forged email addresses. Plus the majority of Notes server installs still run a SMTP server that you can use to get around this, by pointing a regular email client at it and forge addresses to you're hearts content.
