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my private block is 192.168.109.0/24 WAN is 82.198.x.x. and mail server is on 192.168.109.x. I have made the rules dst-nat for port 25,587,993 and 143 with destination 82.198.x.x forwarded to the mail server ip. I have a internal dns server which is resolved from local network. however, I cant access to mail server and showing smtp not reachable though from outside of network am accessing the mail.

What could be the issue

Riad Hossain Bhuiyan
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  • We do need more details in order for us to help. Show the configurations, the logs, the software being used, etc. – Tommiie Dec 07 '20 at 21:02

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When you are connecting, are you connecting to the servers IP-address on your LAN or are you using the domain name (i.e. mail.example.com)? On your LAN; what IP-address do your DNS-record for your mail-server resolve to?

Roland
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