Yesterday afternoon, SpamHaus, the well known email blacklist provider, blocked a large block of IP addresses belonging to Amazon cloud services. Our shared email service uses an IP address that fell within this block of IPs owned by Amazon, and thus affected our clients. (Thankfully, it was a holiday in North America, so the effects were reduced.) Our team was alerted to this late yesterday evening and immediately opened a ticket with Amazon alerting them to this problem. At 2:31am NerdTime this morning this block was removed from SpamHaus’ lists. Amazon reacted very quickly to our ticket, and for that we are thankful.
As usual with Amazon, the reasons behind the block are not forthcoming, but at least they worked quickly to resolve the issue. Some clients may experience problems still today, as some mail providers do not always check with the SpamHaus system for every check, but may cache the results. However, it is rare for a mail provider to block mail on the results of a single blacklist.
Thanks for Amazon’s quick work, this issue should now be resolved. Sorry for any trouble this caused.
Who is SpamHaus? The Spamhaus Project is an international nonprofit organization whose mission is to track the Internet’s spam operations and sources, to provide dependable realtime anti-spam protection for Internet networks, to work with Law Enforcement Agencies to identify and pursue spam gangs worldwide, and to lobby governments for effective anti-spam legislation.
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