When it comes to handling my work-related email, many people will probably conclude that I am an old fart in Linux terms: I still use the console-based Pine as my MUA of choice, as my fingers have been hardcoded to its key combinations over the years (my first encounter with Pine was around 1994 on a shared DEC Ultrix box in my university). So far, I have not found any other application that allows me to process email as quickly as by using this tool.
I admit that I do use Thunderbird for my personal email, though, to gather experience with it (and to toy around with the various extensions, especially Nostalgy is a gift from heaven for people like me!). And of course because the mail volume there is less critical to cope with! But I am not going to start a holy war here - this article is supposed to explain how I have configured my mail setup to rotate the log files that keep track of all my incoming mails.