Email/Webmail storage question

Hi folks,

I'm uncertain whether this is the right forum to post my question. If WRONG please advise me the right place. TIA

Email and Webmail storage question - how to store daily mails chronologically.

Everyday we receive lot of mails on different subjects and from different senders. How to keep all of them in separate files according to subject/date/sender/thread etc. for future reference/retrieval? My solution is copying each mail to a file according to subject/date/sender/thread etc, deleting unwanted paragraphs/texts, if necessary, but it required tedious work, in particular the quantity of daily mail exceeding 100. Is there a software for UNIX/Linux from Open Source which will do the job copying all incoming mails to file according to subject/date/sender/thread etc. If old files already existing it will copy incoming mails to respective files automatically according to option preset. The same can be edited if necessary and searched thereafter.

Any comment/suggestion will be appreciated. TIA

B.R.
Satimis