There is one big difference between snailmail ads and email. With snailmail, the cost is born almost entirely by the sender. With email, the cost is born almost entirely by the receiver.
This may seem like a trivial thing, given that the cost of a single email (or usenet post - a closely related problem) is negligible. But when spam becomes a large fraction of the total traffic, as has happened on usenet, problems arise. Disk space and bandwidth is not free, and the usefulness of the medium is deteriorated. To have a full usenet feed currently requires about 3 T1’s dedicated to the task, and a positively enourmous about of disk space unless you expire in mere hours. The prevalence of spam has forced most ISP’s to shorten the expiration time on many groups and to only accept a subset of the total feed, or else spend money on more system resources to deal with it, which gets passed along to the customer. This doesn’t even take into account that a formerly useful resource is bordering on the useless, and spam can cause valid content to be dropped.
The situation isn’t yet that bad with email, but to some degree this is only because people are actively fighting the problem. It turns out that there are no freedom of speech issues in spam prevention, because the resources are privately owned. Any old ISP who owns their own systems is free to regulate what they do or do not wish to store on those systems. Services such as email and usenet are cooperative by nature, and freedom of speech doesn’t mean you get to use somebody else’s printing press to send you message with.
However, I disagree with something stated earlier in the thread, that anonymity should be prohibited. I think there are valid reasons for sometimes being anonymous. Anonymous participation in untrusted mailing lists such as those for alcoholics or victims of domestic violence, whistleblowing, and so on, I see as valid uses of anonymous email. I think any measure that addresses the spam problem should keep these sorts of things in mind, and in any case, as a practical matter it’s almost impossible to avoid the possibility of anonymity without extending SMTP or inventing a new protocol for the purpose.
I’ve had two “non-disposable” email addresses thus far: one from '83 to '86, and another from '87 to present. I’ve been reasonably careful with the later (the former predated spam, so it wasn’t an issue), and I currently use a hotmail “disposable” email account when I sign up for things that are going to make my email address public. But unfortunately, web based drop-boxes like that didn’t exist when I obtained that addresses, so it does get routinely spammed even though it hasn’t been used publicly for many years, and my spam filters nuke about 95% of the stuff :-(. This annoys me greatly. I’m actually considering changing it, only giving the new one to a few friends, and using disposable accounts for everything else.
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peas on earth