After reading and answering e-mails I usually store them in a hierarchy of mbox-es. Unfortunately finding something there is quite difficult. I have tons of messages and sometimes I file messages under the sender, sometimes under the topic, and I am sure there are also cases, probably lots of them, when I make a mistake and file a messaging in the wrong mbox.
So I decided I'll write a small application to index all the e-mails, put the data in a Mongo database and write a client to search among the messages. Let's start by processing the mailboxes.