Administrator Certification Problem

[kasperd]

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:

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# 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.

[sigmoun]

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 !

[kasperd]

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

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$ 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.

[sigmoun]

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

[kasperd]

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

[sigmoun]

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:

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

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