Maybe I should chime in here. My company also does e-mail marketing.
Our lists are also supposed to be opt-in. All our contracts with clients have verbage that spells out that the lists they supply us are opt-in. We have, in the past, fined clients or dropped them altogether because they broke the rules. Our headers are accurate & the unsubscribe link & unsubcribe “return email” feature works. We have real people in customer service to who I forward irate UCE messages to be manually unsubscribed. Mechanically bounced addresses are removed from our lists when the meet certain frequency requirements.
We don’t violate the TOS of our ISP because we are, effectively, our own ISP and we stay within the rules of our downstream suppliers. We don’t “rent” lists although it’s impossible to determine if our clients do.
All that being said, we know we receive lists from clients that are “dirty”. We’ve discussed making an internal scoring system that’ll rate a list’s quality based on bounce rates & other clues to harvested addresses. At this time, at our volume, it’s not deemed practical. Certain rates of bounces - a good indication of dirty lists - are communicated back to the clients. We try hard to be good internet citizens.
We’ve made mistakes. Once we sent a list that, due to a bug, snipped the first character from every email address. It still delivered over 20% successful to people who, no doubt, didn’t want it. We’ve double sent lists at times. These occurrances are pretty rare but they do happen.
Recipients make mistakes, too. They don’t opt-out when they buy things on the internet. They don’t read the fine print that says that if they’re signing up for a contest, they’re also adding their address to a list. They try to send a unsub from an address that does fowarding.
I handled one irate letter where the person said that the unsubscribe process wasn’t working. Three times he tried to spell “unsubscribe” and three times he spelled it three different wrong ways. The inbound parser never caught it.
Spam is a hot-button issue with a lot of people. Our company is working with the DMA to help come to a common set of rules for commercial email. We’re trying to keep the “U” out of UCE. Email is a great communication medium and there’s certain mail we want to receive. If Amazon uses email to mail you a coupon, is that a good thing? If Eddie Bauer sends you appropriate product information on a non-intrusive schedule, it can be a benefit if you really like Eddie Bauer products. (these are examples - we don’t send for these folks).
My point is that email, like paper catalogs, can be used as a benefit to both sender & receiver if the receiver wants to receive the information. We’re trying hard to make sure that every mail we send is wanted by the recipient.
Sorry for the thread hijack but it seemed relevant.