Watchguard Firebox III 700 routing/NAT issues

I have (2) SMTP servers behind a Watchguard III Firewall.  The SMTP servers are on different domains.

SMTP-1 has a private address of 192.168.1.100 and a public address of 207.x.x.148
SMTP-2 has a private address of 192.168.1.95 and a public address of 207.x.x.146

I configured the Watchguard for 1-to-1 NAT.

I am able to send and receive mail from both servers with the following excption:  Email's sent from SMTP-2 to any address on SMTP-1are queued and never delivered.

I am able to ping 192.168.1.100 from 192.168.1.95.  I am unable to ping 207.x.x.148 from 192.168.1.95
ltrcneAsked:
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dpk_walCommented:
As the servers are behind WG; they must use the internal IP address as oppose the public IP to send email to each other; what happens as with most devices on WG the ingress and egress interface cannot be same; hence you cannot send emails from server1->server2 or vice-versa [by default the SMTP server would use DNS which would direct the request to public IP].

You can configure a secondary zone on the DNS server so that the servers can internally send/receive the traffic.

Thank you.
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ltrcneAuthor Commented:
I was able to resolve my issue my making changes to our internal DNS servers.
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