Guidelines for using email

I've come across too many people & organizations who blindly swear by the integrity of an email: "But look, it says right here it was sent by XYZ!"

Encryption and signing would take care of the interception and authenticity/tampering issue, but there isn't anything that will ever stop the intended recipient of a message from forwarding it indiscriminately.

Overall a good policy and good advice from UW; it's ironic that people who understand how email works tend to trust it less than those who don't. (There's something of a lesson there: if experts in a technology or system are more confident in it than the public, you can probably use it with caution; if experts think the public over-trusts it, run away.)

I disagree. I keep almost all of my email. For me, the cost of storing all email is small compared to usefulness of finding an old email when you need it.