I tried grep first - at 10-12mg / sec disk io it was taking too long... This scans the file in about 10 - 30 sec depending on whether your email is near the to

I tried grep first - at 10-12mg / sec disk io it was taking too long... This scans the file in about 10 - 30 sec depending on whether your email is near the top or bottom... Obviously if the emails where sorted we could do better...