Qmail with PTR check

Hi all,

Some of our client has correspondence deal with AOL server and return
with error messages as follow :

Hi. This is the qmail-send program at mx0.mydomain.net.
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.

<destination@aol.com>:
205.188.155.89 failed after I sent the message.
Remote host said: 421-: (DNS:NR)
http://postmaster.info.aol.com/errors/421dnsnr.html
421 SERVICE NOT AVAILABLE
I'm not going to try again; this message has been in the queue too
long.

--- Below this line is a copy of the message.
...cut..

Seems that AOL reject all email from any domain without PTR setup. We
just fix our problem to do the proper setup of PTR.

Next, we want our mail server doing the same things too. I tried to
search into qmail.org but only find Chuck Foster link to
http://qmail.cbn.net.id/ucspi-tcp-0.84-domain.patch.

The current version of install ucspi-tcp in our box is 0.88

The question are :
+ will ucspi-tcp-0.84-domain.patch work for ucspi-tcp-0.88 ?
+ if no, what other utilities or patches can be used for PTR check
purposes ?

Regards

PD

>From few days searching, I found an article on other mailing list as
follow :

===== start of snipped =====
> (b) whose double-reverse DNS listing doesn't match their IP address, a la
> "tcpserver -p".

worse idea. I actually did this for a while. I had to shut it off
because I
blocked too many hosts (including several mailing lists I'm subscribed
to)

> First: are (a) and/or (b) a Good Idea? (I've seen some opinions to the
> effect that this will result in blocking too much legitimate mail, but
> I don't know if that's still current thinking...)
>
> Assuming they are, it looks like the best idea yet is to run "tcpserver
> -p" and use something like this in the tcprules:
>
> =:allow,
>
> :allow,RBLSMTPD="-You have no reverse dns"

that's how you'd do it. However, I used a slightly less offensive
statement
when I did mine:
:allow,RBLSMTPD="reverse dns lookup failure"

===== end of snipped =====

Can someone give an ideas and or clues ?

Regards

PD