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I have an email server that I use to host email for several companies. &nbsp;Somebody must have sent something out or someone has a virus that flagged our server to be listed on a blacklist.<br />
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How can we combat this? &nbsp;How can we make sure that people using our server does not get it blacklisted? &nbsp;I certainly cannot be going around checking every PC from every company for viruses that uses my mail server.<br />
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Is there any sure way to prevent others behavior from flagging my server?<br />
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I have good policies setup that require authentication and my server is not an open relay.<br />
<br />
Does anyone know of any good sites that check a large amount of blacklists?
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I have an email server that I use to host email for several companies.  Somebody must have sent something out or someone has a virus that flagged our server to be listed on a blacklist.

How can we combat this?  How can we make sure that people using our server does not get it blacklisted?  I certainly cannot be going around checking every PC from every company for viruses that uses my mail server.

Is there any sure way to prevent others behavior from flagging my server?

I have good policies setup that require authentication and my server is not an open relay.

Does anyone know of any good sites that check a large amount of blacklists?

Email Blacklist

Interactions between email servers and clients are governed by email protocols. The three most common email protocols are POP, IMAP and MAPI. Most email software operates under one of these (and many products support more than one).  The correct protocol must be selected, and correctly configured, if you want your email account to work.

Email Protocols

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.