Cox made some changes to their mail servers this morning, leading to some accidental blocks this morning that we understand were not actually listed on the dnsbl referenced. Other sources have confirmed that these blocks were wide-spread and accidental.
Cox seems to have this resolved now and our tests show that previously blocked emails are now being delivered. They responded to earlier cases and asked that customers who had email blocked this morning to try resending their blocked messages.
On Thursday, October 29th, Cox Communications make a number of changes and improvements to their spam filters. They added a special Postmaster
page:
And they added the invaluement.com DNSBLs to the blacklists they use to eliminate spam.
Unfortunately, during the early morning hours after this was implemented, there was a glitch in their system which caused some legitimate e-mail sent to cox.net addresses to mistakenly get blocked, and this was mistakenly attributed to the invaluement lists. (The invaluement.com lists did NOT have those legitimate sending IP addresses
blacklisted.) This glitch occurred between 4 a.m. and 8 a.m. EST on 10/29/2009. The damage was greatly minimized by the off-hours timing of the incident and greatly minimized by Cox's internal whitelist.
The glitch is now completely fixed.
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