Atlanta based Internet service provider Earthlink had an outage for several hours on Wednesday, temporarily interrupting e-mail service. It also knocked offline many of the 87,000 Web sites it hosts, including the company’s own homepage. Several readers have written Security Fix asking what’s up, and some have speculated that the fact that Earthlink was felled on Earth Day was just too perfect to be caused by anything but an attack on the company. The reality is far more ironic: A spokeswoman for Earthlink blamed the incident on a power outage in Pasadena, California.