Ever since i started my quest to declutter, especially my obsession to win back my mail box from the digital clutter, I have come a long way.
But in spite of this, I recently realized how much of email clutter you can stop from entering your mail box by just disabling email notifications from your social networks.
For me, disabling email notifications in LinkedIn and Facebook alone stops at least 10-20 mails reaching my mail box.
And I am sure there are other such places like Twitter, Orkut, etc. where you can disable notifications as well.
But assuming you have this weird obsession to receive every notification by mail, then you can probably opt for a week digest assuming that options is available.