Hi everyone, We are migrating cisco ESA to CES. We started manually mirroring the policies, HATs, RATS, Dictionaries, etc. My question is what are the prerequisites for the SMTP routes since the mail servers are hosted in a private IP addresses?
Normally, when you purchase Cloud Email Security (CES), you are assigned an engineer that will help you with the migration and transition from on-prem to cloud. They would be able to assist with setting this up and answering these types of questions.
What mail servers are you referring to? Do you mean your own local Exchange/SMTP server? If so, then you would need to set up NAT on your edge device so that CES would have connectivity to your mail server(s). The SMTP routes would be set to your public IP on port 25 which then translates on your edge device and is forwarded to your internal Exchange/SMTP.