From AlertFox Website Monitoring
You will receive an email alert immediately whenever a sensor detects a problem (e.g., the site is down or the response time is too slow (timeout)). For iMacros Sensor alerts, the email also contains a screenshot of the website, taken with a real IE or Firefox web browser when the error was detected. You see exactly what your users saw.
You will receive another notification when the site is up again.
Note: With AlertFox V3.0 more advanced notifications are available (see Contacts).
Notifications are sent from firstname.lastname@example.org and email@example.com - Please make sure that this address is not blocked by your spam filter(s).