Casey Bralla on 6 Jan 2011 16:42:49 -0800

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[PLUG] eMail Delivery/Domain Name Problem

I've got a weird eMail delivery problem that I cannot figure out.  Could 
somebody please offer some asistance?

I have begun hosting a local political organization ( on 
my web server.  I also host the domain name on my DNS server, and the eMail on 
an eMail server.   Everything works... almost.

__SOME__ people (notably yahoo) cannot send eMail to anyone at this domain.  
It times out with a "domain not known" error:

Hi. This is the qmail-send program at
I'm afraid I wasn't able to deliver your message to the following addresses.
This is a permanent error; I've given up. Sorry it didn't work out.

Sorry, I couldn't find any host by that name. (#4.1.2)
I'm not going to try again; this message has been in the queue too long.

Oddly, I can send eMails to this same address from work.    

I've done diagnostics on the setup and everything seems fine.  This the same 
system I use from multiple other domains, and have never had a problem.

For reference, here is my bind9 file for this domain:

; DNS master file for

$TTL 2h
@                       SOA    (
                                        2010121302      ; Serial Number
                                        2h              ; Refresh Time
                                        1h              ; Retry Time
                                        2d              ; Expire Time
                                        2h              ; Negative Cache Time
@                       MX              10                                                                     
@                       NS                                                                            
@                       NS                                                                            
@                       IN A                                                                                  

Mail                    IN A                                                                                  
DNS1                    IN A                                                                                  
DNS2                    IN A                                                                                  
DNS3                    IN A                                                                                  
DNS4                    IN A                                                                                  
www                     IN A                                                                                  
FTP                     IN A                                                                                  
                                                                                                                                IN TXT          "Chester County Liberty Alliance"                                                          

Anybody have any ideas why some people can see the domain and some can't?                                                                                                                         


Casey Bralla
Chief Nerd in Residence
The NerdWorld Organisation
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