Cannot send to mailing lists - client host rejected: cannot find your hostname

[rock_on_the_web at comcen.com.au]

I'm having a minor problem with posting to the list. I have my own  
mail server using postfix, fetchmail, and courier. I have several  
domain names, and I'm using one for my mail server.

In my logs I'm seeing 450 errors for freebsd-questions since around  
the end of last year, but I did have some dns issues after I moved the  
server in a clean up and network down disaster at the end of the year.  
Thats all sorted now, but the errors are still there! I just posted  
again and still no luck. I'm using a static address from my ISP, and  
while I can run a server on the system legally, I'm getting no help to  
do so.

Is there a reason for this sudden change? Have the filtering rules on  
the freebsd server changed recently? I can be posted privately if need  
be.

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