If Microsoft Exchange OWA (Outlook Web Access) is in use, the firewall is usually configured to forward inbound HTTP and/or HTTPS connections (port TCP 80 and TCP 443, respectively) to a specific public IP address to the internal server that is running the OWA component. In such a case, one of the following must be done to also provide external access to the web interface of the Sendio ESP:
Configure the firewall to forward HTTP and/or HTTPS on another available public IP to the Sendio ESP. Set up a DNS host (A) record to map a hostname (e.g. sendio.yourdomain.com) to this public IP address. Users can then access the Sendio ESP by simply typing in this hostname in the web browser (e.g “https://sendio.yourdomain.com”).
Configure the firewall to forward a custom port/protocol on the existing public IP address to the standard HTTP or HTTPS port of the Sendio ESP. For example, route inbound TCP 88 to TCP 80 of the internal IP address or TCP 4433 to TCP 443 of the internal IP address. Users can then access the web interface by typing the existing hostname in the browser along with the custom port # (e.g. “http://mail.yourdomain.com:88”).