If you can't, ask the sender to try again in one of the Internet standard file types such as JPEG and GIF for graphics, and Wave files for sound. If all else fails and you still cannot read the file, you might like to e-mail the sender and ask them to send it again in a format you know you can decode. Don't be put off by the problems mentioned here. The vast majority of e-mail is transferred without a single problem. It's a wonderful and very flexible system well worth using.
Many users like to personalise their letters with a unique signature.
This can range from the short Bye to lengthy quotes filling up half a page. There are no rules you have to follow. I would suggest though that you don't overdo the length of your signature. Some people have the ability, accidentally or intentionally, to annoy other users on the Internet. Multiple postings, blatant adverts in the wrong place, and making offensive remarks in sensitive newsgroups can lead to reprisals.