Lindsay Haisley writes:
On Thu, 2013-08-29 at 17:49 +0200, Alessandro Vesely wrote: > To get its house in order, a mailbox provider needs to know how many > messages its users send, how many are reported as spam, and how many > actually are spam, me think. In addition, since email addresses are the > most widely used means of identification, mailbox providers could > provide a tighter control than ISPs.I don't understand the logic of this. If a spammer is using an inbound mailbox as a contact point for spam, which is clearly a violation of the TOS of most mailbox providers, then this will get back quite quickly to the apropriate mail admins.
No, this is something different. This would be the customer's login information getting pilfered, and used to send spam.
There are plenty of trojans that swipe mail client configuration off the mark's PCs. The spammer then knows your customer's login ID and password, connects to your mail servers, authenticates, and starts relaying spam.
The general idea here is to limit your customer to some reasonable limit, say a hundred email messages per hour. A typical customer will never hit it. A spammer with a compromised mail account is going to start spamming and run into the limit almost right away.
A slightly different cap is a cap on the number of recipients, rather than a number of messages.
Most typical customers aren't expected to exceed sending mail to a hundred /recipients/ per hour. Occasionally, you'll find someone who manually runs a mailing list, off his PC, for some reason, instead of using a proper mailing list manager.
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