Servers Configuration:
1.
Exchange Server 2013 + Windows Server 2012
IP: 192.168.3.10 DNS: 192.168.3.2 GW: 192.168.3.3
2.
TMG 2010 + windows server 2008 R2
IP: 192.168.3.3 DNS:192.168.3.2 GW: none
IP: 192.168.1.5 DNS:4.2.2.2 GW: 192.168.1.1
3.
Physical router (internet):
IP: 192.168.1.1 PORT Forwarding PORT 25 TO TMG (192.168.1.5)
Exchange certificates requested from private CA and published trough AD CA services & GPO,all certificates are valid and trusted.
all of exchange internal & external services (pop ,smtp ,imap ,autodiscover, activesync , lync server integration, unified messaging ,....) published and works fine,but cannot receive email from external......
TMG Rules:
testexchangeconnectivity.com& mxtoolbox.com test result:
exchange server port 25 telnet result:
localhost : OK
internal network : Failed
external network : Failed
i do not need email policy, just want to receive email from external. please help....