Managing multuple email addresses

[Bumperlicioso]

Is there a good application for managing multiple email addresses? I have several that I want to outwardly keep separate but I don't remember to check them all and some are with the same provider and I don't want to have to log out all the time.

As long as they all support POP3 or IMAP, you can download them to an email client on your computer and manage them there. Windows Live Mail and Mac Mail work fine, Eudora or Thunderbird if you hate Microsoft/Apple.