Currently we don't permit Tcp25 from public Internet to our Exchange server:
all emails go to our internet-facing ProofPoint , then only ProofPoint forward
it our Exchange 2010 server
We plan to permit Tcp 25 direct into our local Exchange 2010 server from an
IP address ie whitelist this public IP address which is our HQ's ProofPoint IP:
a) if it's only a firewall rule that permit our HQ's ProofPoint IP to come in to
our Exchange server, I guess this IP can be spoofed. What if this IP is also
whitelisted, can it be spoofed as well? I read only Udp can be spoofed or
is this mistaken?
b) is there any risk of MITM attack for this forwarding ? The forwarded emails
are not encrypted
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To show how to create a transport rule in Exchange 2013. We show this process by using the Exchange Admin Center.
Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center.
Navigate to the Mail Flow >> Rules tab.: To cr…
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