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What is your mail domain name? Could you paste the failure report in this page.
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What is your mail domain name? Could you paste the failure report in this page.

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I have a customer that all there outgoing exchange mail has stopped. I have mixed errors. Some show that I may have been blacklisted and others show I may have been attacked by a virus through the NAT port 25. I get the &quot;&nbsp;You do not have permission to send to this recipient&quot; and domain.com #5.5.0 smtp;550 Mail from (server IP Address) refused. I checked with some blacklist websites and they say I am not listed and the &nbsp;CBL site says I am. Can anyone make heads or tails. Ran scans on all stations and the server and found no virus's.
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I have a customer that all there outgoing exchange mail has stopped. I have mixed errors. Some show that I may have been blacklisted and others show I may have been attacked by a virus through the NAT port 25. I get the " You do not have permission to send to this recipient" and domain.com #5.5.0 smtp;550 Mail from (server IP Address) refused. I checked with some blacklist websites and they say I am not listed and the  CBL site says I am. Can anyone make heads or tails. Ran scans on all stations and the server and found no virus's.

Unable to send all Exchange Mail

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.