The ISP's I sysadmin for want some way to archive all mail going to and 
coming from our users to customer-care.

I was thinking something that just dumps a pop3 account into a database 
might be enough.  I would just add a 'ccdump' account to the 
'customer-care' alias and then cron the dump script.

But then I have to write a web interface to the database. :(

Anyone know any open source stuff that already does this?

Suggestions and advice welcome!