snail mail
Definition:
Snail mail is slang for mail delivered by the US Postal Service. The term is used in contrast to the near instant speed of email delivery.
Here's a word you may not know...
instant message
An instant message is a message exchanged between two or more people over the Internet. Messages are delivered instantly (hence the name) and can be replied to as quickly as sending. This exchange of messages is called chatting and is a very popular method for communicating over the Internet. Several different instant messaging applications exist that allow you to send and receive instant messages as well as monitor the online status of your friends, or buddies, who you want to communicate with.