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When we query <a href="http://www.mxtoolbox.com/blacklists.aspx" rel="ugc">www.mxtoolbox.com/blacklists.aspx</a>&nbsp;using our external ip address we are listed on 9 sorbs entries and 1 sorbs-zombie. Our site is by no means intended to be a spam site.<br />
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When we login as a member to <a href="http://www.dnsbl.au.sorbs.net" rel="ugc">www.dnsbl.au.sorbs.net</a>&nbsp;we are told that we are not listed on their blacklist but we are listed on their dynamic ip space.<br />
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What is the best route to follow up this problem....do we try to contact our ISP to resolve why we cant send mail to a spcific web address or is there a better way of clearing our name from whatever blacklist is blocking certain mail that we are trying to send? 
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When we query www.mxtoolbox.com/blacklists.aspx using our external ip address we are listed on 9 sorbs entries and 1 sorbs-zombie. Our site is by no means intended to be a spam site.

When we login as a member to www.dnsbl.au.sorbs.net we are told that we are not listed on their blacklist but we are listed on their dynamic ip space.

What is the best route to follow up this problem....do we try to contact our ISP to resolve why we cant send mail to a spcific web address or is there a better way of clearing our name from whatever blacklist is blocking certain mail that we are trying to send? 

How to get removed from a Blacklist?

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.

Networking

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

The term broadband commonly refers to high-speed Internet access that is always on and faster than the traditional dial-up access. Broadband includes several high-speed transmission technologies such as digital subscriber line (DSL), cable, fiber optics, wireless (for which there is a separate topic), satellite and broadband over powerlines (BPL).