> 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
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
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