Let us assume that I have a mail server behind a public IP address: P.P.P.15
Astaro is sitting on an external public IP at P.P.P.14 / 29 (with a gateway at P.P.P.13 - the mail server is sitting on an extra IP address - everything is behind a Cisco 2800).
Assuming that the internal IP of my mail server is at 192.168.1.2, what masquerading, NAT and packet filtering (among anything else) must be put in place by Astaro to get SMTP in and out? At this point, I have the external interface configured on the P.P.P.14 address with a the mail server IP assigned as an "Additional Address".
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