All my inbound mail is 'deferred' (connection refused)

[mike.suding]

Today I downloaded and installed 4.5.4 GA on a single server.
I used the appliance ISO (uses rPath linux).
The server is NATed behind my linksys firewall. (port 25 etc is open/forwarded)

I can send outbound mail just fine.
All Inbound mail shows in the queue as "deferred"
If i hover over the message, it shows this error:
Reason: connect to mail.wowie.us[206.55.152.34]: connection refused

I read some other posts about making sure the hosts file has some entries
Mine has this (in this order)

# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 mail.wowie.us localhost.localdomain localhost mail
192.168.1.44 mail.wowie.us mail
206.55.152.34 mail.wowie.us mail

On the console of zimbra server I can ping Yahoo! etc and it resolves fine.

How can I fix this?
Thanks

[phoenix]

Remove this line

206.55.152.34 mail.wowie.us mail

from your hosts file and install a local DNS server for a Split DNS.

[phoenix]

In addition, you should also change this line

127.0.0.1 mail.wowie.us localhost.localdomain localhost mail

to this

127.0.0.1 localhost.localdomain localhost

[mike.suding]

the instructions on the wiki mention Red Hat. I just wanted to make sure.
thanks