Posts Tagged ‘ postfix ’
This morning we had a DDOS attack on our mail server. Some @$$ trying to swamp our postfix service with hundreds of connections. SO, I did something I did not want to do, but, oh well.
This following bit below will explain a few things and will allow you to limit the amount of active connections to any port on your server with iptables.
An issue I recently encountered with some mail servers was poor MTA reputation. Even though the servers were only used for corporate email, somehow their MTA is poor at senderbase, even though none of the IP’s are on a single RBL/SBL. This is partly due to Slicehost having bad IP blocks and the method they use for assigning IP’s to new slices. But I believe the issue can be resolved with good history.
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