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SOLVED !
I have send a mail to the support explaining them that a HE user (you) was able to send mail to my mailserver. This is their response:

Code:

Should be better at this time.  Looks like a stale cache entry was the
issue.

Thank you for your help!!!!!!!!!

So could'nt the administrator system send me mail

Time to fire up tcpdump. If you have tcpdump on the router, then running it on the router is the best option. Otherwise it could still be useful to run it on the mailserver.

I think the tunnel interface on the router is the best one to look at for debugging this issue. I imagine something like this tcpdump -pni sit1 -s0 -Uw smtp.pcap which would dump all the traffic from the sit1 interface to the file smtp.pcap.

Then while the tcpdump command is running, you try the certification test again. Once it has produced an error, you can stop tcpdump and look at the result with something like tcpdump -nr smtp.pcap

Yes I have received the mail 
So could'nt the administrator system send me mail

Can you try to send mail to sigmoun@zied.forbidden-access.org through telnet ?

Code:

$ telnet -6 zied.forbidden-access.org 25
Trying 2001:470:28:f0a:6510:c8c3:a3cf:f911...
Connected to zied.forbidden-access.org.
Escape character is '^]'.
220 zied.forbidden-access.org ESMTP Postfix (Ubuntu)
HELO bfbqv.25.may.2013v6.kasperd.net
250 zied.forbidden-access.org
MAIL From:<blackhole@bfbqv.25.may.2013v6.kasperd.net>
250 2.1.0 Ok
RCPT To:<sigmoun@zied.forbidden-access.org>
250 2.1.5 Ok
DATA
354 End data with <CR><LF>.<CR><LF>
From: blackhole@bfbqv.25.may.2013v6.kasperd.net
To: sigmoun@zied.forbidden-access.org
Subject: 2895

https://www.tunnelbroker.net/forums/index.php?topic=2895

.
250 2.0.0 Ok: queued as 0D52F1F16
QUIT
221 2.0.0 Bye
Connection closed by foreign host.

I have [2001::]/16 to "mynetworks" in the /etc/postifix/main.cf
So that's why you can telnet it.
But still same problem...
Can you try to send mail to sigmoun@zied.forbidden-access.org through telnet ?
Thanks !

So it looks like nothing is listening on port 25 on that host. That would explain why no email can be delivered to it. So check again that the mailserver is indeed running on zied.forbidden-access.org, and check which IP it is listening on. Maybe it is listening only on ::1 or maybe it is listening only on IPv4.

I see you got that working now:

Code:

# telnet -6 zied.forbidden-access.org 25
Trying 2001:470:28:f0a:6510:c8c3:a3cf:f911...
Connected to zied.forbidden-access.org.
Escape character is '^]'.
220 zied.forbidden-access.org ESMTP Postfix (Ubuntu)
QUIT
221 2.0.0 Bye
Connection closed by foreign host.

I hope the certification test passes now.

by the way, the he support answer was

Code:

SMTP is not filtered to/from the system that performs the administrator
test.

They may have misunderstood the question. But then again, I haven't seen the question you send to them.

I know the filters don't prevent going through the certification test, if you got the mailserver setup correctly. But the filter prevents anybody else from trying to connect to the server to find out, why it isn't working. That means you cannot just go to the forum and ask for help, because nobody on the forum can see what is happening behind the HE filters.

That is why I suggested that you go to ipv6@he.net and ask for the advice, you could previously have gotten from the forum. But they appear not to have understood that point.

I guess that just means whenever such question shows up, I'll advice people to setup a Teredo relay instead. No harm done, if many of the people going through the certification test learns to setup a Teredo relay. And now if you happen to want to ssh back home from your laptop, and you are somewhere with only IPv4 connectivity, then you can just use a Teredo client on your laptop. :-)

What should I do now ?

I tried running an nmap against your IPv6 address, now that your Teredo relay is functional. This is what I got:

Code:

nmap -6 zied.forbidden-access.org

Starting Nmap 5.21 ( http://nmap.org ) at 2013-05-25 16:31 CEST
Nmap scan report for 2001:470:28:f0a:6510:c8c3:a3cf:f911
Host is up (0.095s latency).
Not shown: 998 closed ports
PORT   STATE SERVICE
22/tcp open  ssh
80/tcp open  http

Nmap done: 1 IP address (1 host up) scanned in 5.23 seconds

So it looks like nothing is listening on port 25 on that host. That would explain why no email can be delivered to it. So check again that the mailserver is indeed running on zied.forbidden-access.org, and check which IP it is listening on. Maybe it is listening only on ::1 or maybe it is listening only on IPv4.

by the way, the he support answer was

Code:

SMTP is not filtered to/from the system that performs the administrator
test.

yes I have installed Terodo as you asked and forward the port from my router...
What should I do now ?