I added NAT policy in my firewall for my mailserver to access out side of the office, but i am unable to access .
Please help me
I have no idea what firewall you are using. Your posting is lacking crucial detail and that makes this almost impossible to answer you. However, I use a Cisco 5520 in a Data Center and i Host my own Exchange server. This is what you have to do to allow inbound and outbound SMTP traffic in that type of environment.
name (Internal IP here) Exchange description Internal mail server
access-list Inside_access_in remark Allow internal Exchange Server to send SMTP email outbound.
access-list Inside_access_in extended permit tcp host (Internal IP Here) any eq smtp
access-list outside_access_in remark Allow external entities to send SMTP email to Exchange Server
access-list outside_access_in extended permit tcp any host (Public IP Here) eq smtp
Hope this helps you.
Brian
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