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All emails sent from our domain to @comcast.net addresses are being filtered out as SPAM

Hello, We are using Exchange Server 2003 and Comcast Business Internet Service, and are unable to send any emails to Comcast recipients. I have added a PTR record, SPF record, as well as setting the exchange server to use external DNS, but that did not fix the problem. As a test I logged into my per

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All emails sent from our domain to @comcast.net addresses are being filtered out as SPAM

Hello, We are using Exchange Server 2003 and Comcast Business Internet Service, and are unable to send any emails to Comcast recipients. I have added a PTR record, SPF record, as well as setting the exchange server to use external DNS, but that did not fix the problem. As a test I logged into my per

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