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).
Calculating the calories required to lose a pound and fine-tuning your caloric deficit. 1  3500 calories to lose a pound has always been the rule of thumb. 2  However, this 3500 calories figure goes back to research which assumed that all the weight lost would be adipose tissue (which would be ideal, of course).