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).
Since 3500 calories make 1 pound, you need to burn 3500 calories in a week, in case you want to lose a pound. This means that your caloric intake should be 500 calories less than your daily caloric requirement. In case you plan to work out and diet on a daily basis, this is the right target for you.