Comcast SMTP server is blacklisted

​76.96.107.72 (omta02.potomac.co.businessclass.comcast.net.) the recommended SMTP server for business customers are blacklisted by NiX Spam run by a German ISP. ​

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​Could someone from Comcast support please visit their Web site and fill in the form requesting for unblock.​
​http://www.dnsbl.manitu.net/​

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