Talk to your ISP's (Verizon's) tech support and tell them to fix the problem.  
That's their job.  There should never be any reason to blacklist an entire 
domain, especially a large one, unless it is truly a rogue domain.  If you are 
a business customer, give them even more grief and tell them how their failure 
to immediately deal with blacklisting is damaging your business.

But one solution is to have an alternative e-mail address (or more) at an 
alternative domain, so that if the domain you are sending from has been 
blacklisted, you can get messages out from the alternative address.  The 
alternative address doesn't have to cost -- gmail is free.

I think the problem is that there is automation that blacklists an entire 
domain if too many messages from it are auto-detected as spam.  The false 
positive consequences are large.  However, maybe it's a way of getting 
Verizon's attention about a problem they should have detected and fixed 
themselves.

Fred Holmes 

At 08:32 AM 12/13/2008, Mike Sloane wrote:
>Follow up: I went to Comcast's help site and found out that they use 
>TrendMicro for a spam filter, and it has identified verizon.net as a spam 
>source and blocked everything. Now I don't know what to do.
>
>Mike
>
>Mike Sloane wrote:
>>All of the messages I have sent in the last two days to recipients with 
>>comcast.net IDs are bouncing back with the explanation: "Reason: Illegal 
>>host/domain name found   Remote system: dns;mx2.comcast.net 
>>TCP|206.46.173.3|51451|76.96.30.116|25"
>>Has anyone else had that problem? Or is it something local? It appears to be 
>>a DNS problem from what little I can make of the explanation.
>>Mike
>
>
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