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email Server port forwarding

I defined my email server during setup.
Synology Mail Server
Host (NasMINI)
192.168.1.200

I created an alternate external IP address to connect to my email server like so many of the posts and tutorials suggested.

I created a DNAT
Rule Type: DNAT (Destination)
For Traffic From: Any
Using Service: Email Messaging (Also attempted to simply allow any)
Going To: External (Wan)

Changing the Destination To: NasMINI
And the Service To: blank

I have tried checking the Auto Create rule line

but it doesn't work!! the email server has no response

I also find the firewall already pass this NAT rule.

POP3 port : 110 and SMTP port :25

but doesn't work!!!!

any one can help me! thank you!

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0 Scott_Klassen over 9 years ago

Sounds like you're trying to connect to your own WAN interface from an internal LAN client. This will not work with a DNAT, which is used for external clients to reach LAN or DMZ services. For this operation, you'd need a full NAT. See https://www.sophos.com/en-us/support/knowledgebase/115191.aspx
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0 serend over 9 years ago in reply to Scott_Klassen

Sounds like you're trying to connect to your own WAN interface from an internal LAN client. This will not work with a DNAT, which is used for external clients to reach LAN or DMZ services. For this operation, you'd need a full NAT. See https://www.sophos.com/en-us/support/knowledgebase/115191.aspx

I created a new Full Nat rule, and it works, Yes you are right, WAN interface from an internal LAN client do not work with a DNAT, thank you very much for your help
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0 serend over 9 years ago in reply to Scott_Klassen

Sounds like you're trying to connect to your own WAN interface from an internal LAN client. This will not work with a DNAT, which is used for external clients to reach LAN or DMZ services. For this operation, you'd need a full NAT. See https://www.sophos.com/en-us/support/knowledgebase/115191.aspx

I created a new Full Nat rule, and it works, Yes you are right, WAN interface from an internal LAN client do not work with a DNAT, thank you very much for your help
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