A digest of email

I receive about 300 mails in 24 hours. Of these, those that are important to me or those that need my attention is only about say, 50. However, I need to go through all the 300 mails to get those 50 mails relevant to me. It takes a lot of time to go through mail by mail. My question is, is there a way to get all the mails in a single file? All I will need to do is simply scroll down and select / read mails relevant to me with ease. Something like a mail digest?

If such a feature or something similar is already available, please let me know.

Thanks,
K.Lakshmi Shankar