Ah, the days of mailing lists and e-mail chains. I do not miss those.
Anyhow - These same two policies apply to posting on the forums. Try not to cause blatant spam here as well. Try to put some thought behind your posts. Avoid pointless, non-constructive comments.
Remember - I'm always reading... everything... 
Its like replacing the devil with belzebub. Either I have spam in my emailbox or on the forum. The problem is shifted to a different place and not solved.
The bad thing about emails is:
New members are utterly confused and miss out vital informations. They sometimes even give up due to the mass of informations.
People ignore reply emails (mostly they are only "yeah, great, you rock", .. ), because they learned that most of them are pointless. But some are important. Informations are being lost.
Recently NagaSadow-mailinglist has turned into a spam-discuss-we-communicate-wildly-here. I don't mind communication at all, but I hate to see an email with of dozens of pointless replies. Furthermore some people don't use gmail and the quoted text appears up additionally. It makes you scroll and scroll and scroll and scroll.
We could go and tell people to use gmail, but some don't want to switch. (I know a couple of people who don't want to miss features of hotmail. Others can't access their emails being constantly online since its a browser-email-client.
Unfortunately I am not too content with gmail myself. I am missing a lot of features. I am still thinking of switching back to yahoo. But then I would have to deal with 60 emails in a row (from which there are 4 original emails and 56 useless replies).
I am not asking for all communication to stop.. not at all. I am happy to see that we do communicate at all.
But I think the solution is not email-management, but more self-discipline. Emails are not being considered like a chat message. I am also a highly commicative person, but you rarely see me replying to emails, unless it is constructive. In the end its a reply that contains much more than just a simple: "wooo hoo great!".
It kinda makes me feel to simply give up, ignore reply emails and deal with the fact that I will overread vital informations. At least it will keep my stress level much lower, instead of being heavily annoyed. Saves me a few years of my life. I may not be as efficient as normally, but thats the price...
Sildrin