Most of us use either Outlook or an online web client such as Gmail or Hotmail for e-mail but some people have particular demands from their e-mail client due to the amount of mail they receive.
For those that receive very large amounts of mail daily, none of the above are particularly helpful when it comes to organizing content. MailSteward can help in this regard because it helps to control and organize large amounts of mail automatically so that it's easy for you to read and filter. Unfortunately, MailSteward doesn't work with web based clients although you can always redirect your mail to a desktop client.
With MailSteward, you can safely archive your large volume of vital email information, easily access your email database with fast, sophisticated searching and protect your essential email data from data formatting by locking important batches of mails. MailSteward can be a little tricky to configure but once you've done so, it works quietly in the background.
If you're already using another mail client such as Entourage you can export mbox files to MailSteward which could make your life seriously easier.