Mail transport advanced settings

You can customize SMTP task configuration:

Search for sender's originating IP address in headers

If enabled, ESET Mail Security looks for the originating IP address in message headers so different protection modules (Antispam and others) can use it. If your organization is separated from the internet by a Proxy, Gateway or Edge Transport Server, email messages appear to arrive from single IP address (usually an internal one). It is common that on the outside server (for example, Edge Transport in DMZ) where a sender's IP address is known, this IP address is written into the message headers of the email messages being received. The value specified in the Header with the originating IP field below is the header that ESET Mail Security looks for in message headers.

Header with the originating IP

Is the header that ESET Mail Security looks for in message headers. The default is X-Originating-IP, but if you are using third-party or custom tools that use a different header, change it to an appropriate one.