I have encountered a problem that prevents me from sending email from my home computer. (I can remote office to my exchange server and have no issue), since early this afternoon I get the following reply.
Your message did not reach some or all of the intended recipients.
Sent: 1/21/2013 6:29 PM
The following recipient(s) cannot be reached:
'firstname.lastname@example.org' on 1/21/2013 6:29 PM
Server error: '554 5.7.1 Service unavailable; Client host
[220.127.116.11] blocked using dnsbl.sorbs.net; Dynamic IP Addresses See:
»www.sorbs.net/lookup.shtml?174.1 ··· 1.58.xxx
I have researched via the link provided and it appears that the ENTIRE group of IP addresses assigned dynamically are being blocked. I attempted to contact RR Tech Support and performed a number of tasks in an attempt to refresh the IP assigned to my system but to no avail. I can only get two different ones assigned, (it seems to be assigning according to MAC) and both addresses are coming up blocked (172.111.58.xx and 174.111.40.xxx).
My understanding of the issue is that because RR assigns addresses dynamically within the block of addresses shown in the blacklisting, SORBS is treating all addresses the same. I have been running Nortons 360 on all my computers for many years and practice safe wireless access utilizing 64 bit password to access. I have checked my systems and do not find anything questionable from within my residential domain. It appears I am suffering from the abusive acts of someone else within the RoadRunner network I access.
The earliest reference to a SORBS issue comes from 2006 so not sure if I'm hitting all my sources yet but any response would be appreciated.