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you’re certainly not alone (and not using our spam filters). At about 7 pm yesterday (Swedish time) someone thought it would be a good idea to send a massive burst of spam. It seems that for many of our customers, that single spam outbreak accounted for as much as 70-90% of the total traffic. It seems that all of them used “yahoo.nl” as sender domain, which (unsurprisingly) doesn’t use SPF.
Fortunately, the combination of Commtouch’s RPD and our own (Halon) outbreak signatures was able to block it entirely, from 6 pm.
We can see that a lot of this was also blocked at IP level. The “normal” amount of IP blocks is almost invisible in the graphs, compared to the spam outbreak. I’ve removed the axis of the graphs, but let me tell you this. One of our customers, which is a large hosting provider, blocked more than 4 million of those per hour. That sure is a pretty persistent spammer.
The Halon MTA is a flexible email operations and security platform.
It enables organisations that operate large-scale email services to offer competitive features by rapid implementation
and to lower maintenance costs through reliable deployment and reduced complexity.