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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

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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

T

were you able to resolve this? II called Comcast / Xfinity and they said Comcast.com doesn't even exists for email addresses. I had to explain the support tech it does and that we communicate with an employee with comcast.com We h

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