Ach, wenn sich im Internet (und anderswo) alle an die Netiquette von 1995 hielten ...
[...]Unless you are using an encryption device (hardware or software), you should assume that mail on the Internet is not secure. Never put in a mail message anything you would not put on a postcard.
[...] Respect the copyright on material that you reproduce. Almost every country has copyright laws. [...]
A good rule of thumb: Be conservative in what you send and liberal in what you receive. You should not send heated messages (we call these "flames") even if you are provoked. On the other hand, you shouldn't be surprised if you get flamed and it's prudent not to respond to flames. [...]