![]() That is: I am using two more listeners on port 2525 of the original Incoming/Outgoing interfaces aka IP addresses. I personally prefer the second one: own listeners for the encryption appliance. nothing of those two methods, but filter only for the sending remote-ip.own Listeners (that is: using an already available IP Interface but with a different listening port), or.own IP Interfaces (that is: Layer 3 addresses on Ethernet ports),.I wanted to have different firewall policies between the appliances matching the SMTP sessions exactly along the path. My goal was to unambiguously receive mails from the encryption appliance. There are many different possible mail flow designs. ) That’s why you should not use content filters that are executed after that Anti-xyz stuff for these scenarios. This results in a good mail flow design since checking a fully encrypted mail for Spam is ridiculous. Using message filters here gives the chance to alter the mail flow even before Anti-Spam kicks in. Message filters are processed before the email security manager with all of its components such as Anti-Spam, Anti-Virus, AMP, and so on. Such mail routings should be done with CLI-only message filters, rather than content filters. However, the Cisco ESA still remains the main MTA for incoming and outgoing mails, hence mails must be routed to the encryption appliance of your choice for signing/encrypting (outgoing) or verifying/decrypting (incoming) mails. That is: We are using other appliances for that such as Zertificon, SEPPmail, or totemo. But it completely lacks a usable implementation for mail encryption with S/MIME or OpenPGP. The Cisco Email Security Appliance (ESA) is well-known for its very good Anti-Spam features.
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