is is able to setting up DNS server reverse lookup with DynamicIP?

[vuthecuong]

Olivier Nicole wrote:
>> But my postfix only can receive mails from freebsd-questions mailing
>> list, it can not send mail to this. 
>>     
>
> There is another thing you have to consider. As it is explained in
> http://www.bsdforums.org/forums/showthread.php?p=265093#post265093
> your dynamic IP has been black listed (the IP was used before by
> someone else who sent SPAM, so now the IP is in a list of bad guys and
> many mail server will refuse to receive emails from your IP).
>
> So it is really a better idea that you sent all your email thought FPT
> email server.
>
> Best regards,
>
> Olivier
>
>   
OK I understood, this is one lession I learned today: In order to run 
"real" mail server,
fixed IP address for forward and reverse DNS is must-have.
I will choose method of relaying through ISP though I prefer the first one.
Tnx you very much.