Problem delivered mail

[simone@xxxxxxxxxxxxxxxxx <simone@xxxxxxxxxxxxxxxxx>]

Hi,
I have a problem send mail used my server:

mixminion@prank:~/mixminion/bin$ ./mixminion send -t  netman@xxxxxxxxxxxxx
-P "prank,?"
Mixminion version 0.0.8alpha3
This software is for testing purposes only.  Anonymity is not guaranteed.
May 14 12:11:48.963 +0200 [WARN] Directory /home is writable by group staff
(mode 775)
May 14 12:11:49.035 +0200 [WARN] This software is newer than any version on
the recommended list.
Enter your message.  Type Ctrl-D when you are done.
kkkkMay 14 12:11:52.996 +0200 [INFO] Generating payload(s)...
May 14 12:11:53.009 +0200 [INFO] Selected path is prank:frell
May 14 12:11:53.038 +0200 [INFO] Packet queued
May 14 12:11:53.039 +0200 [INFO] Connecting...
May 14 12:11:53.781 +0200 [WARN] Couldn't connect to 'prank' at
prank.dyndns.org:48099 (fd 3)
May 14 12:11:53.785 +0200 [INFO] Error while delivering packets; leaving
1/1 in queue
May 14 12:11:53.786 +0200 [INFO] Error was: Error occurred while delivering
packets to 'prank' at prank.dyndns.org:48099
mixminion@prank:~/mixminion/bin$

and manually flush egual.

mixminion@prank:~/mixminion/bin$ ./mixminion flush
Mixminion version 0.0.8alpha3
This software is for testing purposes only.  Anonymity is not guaranteed.
May 14 12:10:06.743 +0200 [WARN] Directory /home is writable by group staff
(mode 775)
May 14 12:10:06.747 +0200 [INFO] Flushing packet queue
May 14 12:10:06.756 +0200 [INFO] Found 8 pending packets
May 14 12:10:06.765 +0200 [INFO] Sending 8 packets to server at
prank.dyndns.org:48099...
May 14 12:10:06.766 +0200 [INFO] Connecting...
May 14 12:10:07.986 +0200 [WARN] Couldn't connect to server at
prank.dyndns.org:48099 (fd 3)
May 14 12:10:07.990 +0200 [INFO] Error while delivering packets; 8/8 left
in queue
May 14 12:10:07.990 +0200 [INFO] Error was: Error occurred while delivering
packets to server at prank.dyndns.org:48099
May 14 12:10:07.991 +0200 [INFO] No packets delivered
mixminion@prank:~/mixminion/bin$

my network is 

prank.dyndns.org ----> my router ----> forward external ip in internal door
TCP 48099 --> ip 192.168.x.x

i dont no help my. 
--------------------------------------
mixminion@prank:~/mixminion/bin$ ping prank.dyndns.org
PING prank.dyndns.org (151.20.200.105) 56(84) bytes of data.
64 bytes from ppp-105-200.20-151.libero.it (151.20.200.105): icmp_seq=1
ttl=254 time=0.569 ms
64 bytes from ppp-105-200.20-151.libero.it (151.20.200.105): icmp_seq=2
ttl=254 time=0.534 ms
--------------------------------------
-- 
“La sicurezza di un crittosistema non deve dipendere dalla segretezza
dell’algoritmo usato, ma solo dalla segretezza della chiave”
---------------------
gpg --keyserver pgp.mit.edu --recv-keys EBFFEE94

Fingerprint= 9E78 B50F AC6B 6911 08D7  76BE 0DED 6BE1 EBFF EE94