As in the previous scenario, also ensure that SMTP port 25 is open on
the firewall for both the Edge Transport and Hub Transport servers to send and receive emails.
2. DNS: The Edge Transport servers in the perimeter network and the Hub Transport servers in
the Exchange organization must be able to locate each other by using host name resolution. You
must specify the appropriate DNS suffix for the Edge Transport server prior to its installation.
On the DNS servers that both the Edge Transport and Hub Transport servers are configured to
point to, configure host records in the appropriate forward lookup zones to resolve each server.
Alternatively, you can create host file entries on both the Edge Transport and Hub Transport
servers to resolve each other.
3. Configure Accepted and Remote Domains: This step must be performed on the Hub Transport
server and prepares the information to be propagated to the Edge Transport server. Accepted
domains are any Simple Mail Transfer Protocol (SMTP) namespace for which an Exchange
organization will send or receive email, including domains for which the Exchange organization
is authoritative, which means the Exchange organization will handle email delivery for
Recipients of that domain. By default one accepted domain is created and configured as
authoritative during Exchange installation.
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