SPAM blacklists are domain and IP address inventories of senders with poor reputations which sometimes help mailbox providers determine whether to place messages in recipient inboxes. Large trustworthy companies, as well as small, independent networks, create these lists and each provider uses them differently.
Typically, mailbox providers combine data from various public blacklists — as well as information from their own networks — to determine the credibility of a sender. Subsequently, many lists have little to no effect on IP reputation. Major providers disregard low-priority lists entirely and only use information from high-priority services such as SpamHaus and SpamCop.
Blackbaud subscribes to ReturnPath — the email industry’s leading deliverability solution provider — to monitor external blacklists for our IP addresses. When necessary — such as on the rare occasions when SpamHaus or SpamCop list our IP addresses — our team of email specialists immediately request to delist them. We recommend you use services such as uribl.com to monitor your domain and, if necessary, request to de-list it.
Note: Blacklist companies don’t block messages. Rather, mailbox providers use the listings as reasons for blocks. To prevent blocking, we recommend you manage your list quality and maintain a database of engaged recipients.