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I was able to resolve my issue my making changes to our internal DNS servers.
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I was able to resolve my issue my making changes to our internal DNS servers.

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I have (2) SMTP servers behind a Watchguard III Firewall. &nbsp;The SMTP servers are on different domains.<br />
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SMTP-1 has a private address of 192.168.1.100 and a public address of 207.x.x.148<br />
SMTP-2 has a private address of 192.168.1.95 and a public address of 207.x.x.146<br />
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I configured the Watchguard for 1-to-1 NAT.<br />
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I am able to send and receive mail from both servers with the following excption: &nbsp;Email's sent from SMTP-2 to any address on SMTP-1are queued and never delivered.<br />
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I am able to ping 192.168.1.100 from 192.168.1.95. &nbsp;I am unable to ping 207.x.x.148 from 192.168.1.95<br />

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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


Watchguard Firebox III 700 routing/NAT issues

Software firewalls, also known as host-based firewalls, provide a layer of software on one host that controls network traffic in and out of that single machine. Most operating systems now include firewall software, but many available software firewalls include central distribution, antivirus systems and disaster recovery.