List Security
On both discussion lists and newsletter lists precautions are taken to avoid spamming.
Discussion lists often require every message to be approved by a moderator before being sent to the rest of the subscribers, although higher traffic lists typically only moderate messages from new subscribers, and only then for a time. Companies sending out promotional newsletters have the option of working with whitelist mail distributors, which agree to standards and high fines from ISPs should any of the opt-in subscribers complain. In exchange for their compliance and agreement to prohibitive fines, the emails sent by whitelisted companies are not blocked by spam filters, which can often reroute these legitimate, non-spam emails.
Read more about this topic: Electronic Mailing List
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