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unable to send email to comcast.com addresses

I have my own private mail server which is able to send mail to just about anyone. One key exception is any address at comcast.com. I can send mail to comcast.net addresses but not comcast.com for some reason. I am not listed on any known blacklists. $ telnet mx1.comcast.net 25Trying 96.114.157.8

Thanks for responding, Gina. Are you absolutely sure that is the case? I have some comcast.com addresses in my contact list (employees of Comcast) and I have always been able to e-mail them in the past. Also, I have another server with another pro

unable to send email to comcast.com addresses

I have my own private mail server which is able to send mail to just about anyone. One key exception is any address at comcast.com. I can send mail to comcast.net addresses but not comcast.com for some reason. I am not listed on any known blacklists. $ telnet mx1.comcast.net 25Trying 96.114.157.8

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