First of all, both tools are uses for communication in society, and they are both under risk in terms of confidentiality, but for different reasons. For instance, you cannot be secure that all post offices are safe enough to send your messages that are too personal or contain secret information about your work… etc. E-mails suffer from the same problem but for different reasons. For example your computer can become a victim of hacking and a hacker can get your whole archive in a few seconds. Finally, once they are delivered to the wanted place there is no way going back.
Although they share some common points, snail mail and e-mail are tremendously different in many ways. Firstly, e-mail is way a lot faster than snail mail, it enables you to delivers your message in the blink of an eye, whereas it might take days for a snail mail to receive the place you want. Secondly, for sending an e-mail all you need is an internet connection and you can send it to hundreds of people at once, nonetheless, you can send a snail mail once at a time and you have to pay for it respectively. Moreover, there are many options for editing an e-mail and sending different types of media files along with it, in contrast to snail mail with which you can only send text messages. In addition, nowadays people are very busy to memorize the address of all of their acquaintance, e-mail solves this too, you can save all of those confusing addresses in your account without any