When trying to send mail through the SMTP server, an error message is generated in the e-mail client indicating that the server cannot be found or the server terminated the connection. Certain ISPs (noteably SBC and Earthlink) block outgoing mail that is not sent through their servers.
One pound of fat is equal to about 3500 calories. That means that if you eat an extra 350 calories of food a day, which is about equal to a large piece of cake or a medium milkshake, you would gain an extra pound about every 10 days (350x10). Or you would gain a pound in about 20 days if you eat or drank an extra 175 calories a day (175x20).
Each pound of fat that your body stores represents 3,500 calories of unused energy. In order to lose one pound, you need to create a calorie deficit of 3,500 calories by either consuming 3,500 less calories over a period of time than your body needs or by doing 3,500 calories worth of exercise.