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I've got two clients running MS Exchange that use SpamHaus and SpamCop to filter incoming email.  Neither of them could receive email from just about anybody yesterday.  We disabled the filters and everything started flowing again.

When checking their IPs at MXToolbox, it looked like a lot of the RBL services were timing out.  Was their something big going on yesterday?

While we have seen an immense increase in Viruses this month, we have not seen any other strangeness with RBLs in general. Spam and Viruses have risen by over 50% this month alone so that may be one reason that RBLs are listing more and more IP Addresses.

Please keep in mind that this is just a theory, we have not noticed any strange activity other than the rise of Spam and Viruses. If your domain is experiencing more spam than normal and you are looking for a solution, please check out our Spam and Virus filtering services at MxToolBox.

Thank you,
Wendy