[afnog] failure delivery note

[Tizhe Bitrus Zira]

Hello all,

Each time I send a mail to the folowing address xxxxx(address delibrately
hidden)I get the follwing messege: See below.

Please can someone help me out. what do I do?

The Postfix program

<xxxxx at ustti.org>: host smtp-in.his.com[72.66.110.135] said: 554 5.7.1
    Service unavailable; Client host [82.206.136.77] blocked using
    b.barracudacentral.org;
    http://www.barracudanetworks.com/reputation/?pr=1&ip=82.206.136.77 (in
    reply to RCPT TO command)

<xxxxx at ustti.org>: host smtp-in.his.com[72.66.110.135] said: 554 5.7.1
Service
    unavailable; Client host [82.206.136.77] blocked using
    b.barracudacentral.org;
    http://www.barracudanetworks.com/reputation/?pr=1&ip=82.206.136.77 (in
    reply to RCPT TO command)


++++++++++++++++++++++++++++++++++++++++++++++++++
Tizhe Bitrus Zira CCNA, CCAI
Network Technician
UJNet Department
University of Jos
Jos- Nigeria
Phone:2348036125887
E-mail:bitrust at unijos.edu.ng, tjaybit at yahoo.com, tjaybit at gmail.com
+++++++++++++++++++++++++++++++++++++++++++++++++