E-mails not received by comcast.net addresses

Our company e-mails are not being received by employees and customers who have a comcast.net address. We have experimented and "CC"ed e-mails to other addresses, g-mail, yahoo, and our company e-mails. The e-mails are received by other servers but not comcast. We can receive e-mails from the @comcast.net addresses. But even replying to that e-mail is not received by the comcast address. The messages are shown as "sent" and there is no bounce-back message, and the e-mails do not appear in their spam folders. Is there anything we can do about this, or does it have something to do with individuals with @comcast.net addresses?
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Teddy JonesAsked:
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Edward PamiasTeam Lead RRS DeskCommented:
I would have the recipient contact comcast and tell them your emails are being blocked.
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masnrockCommented:
What are you running for email on your side, and do you have SPF records in place?
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Teddy JonesAuthor Commented:
I was able to find and fix the issue with Go Daddy. It was an issue with my C-panel. Under the E-mail's MX-Entry tab, under the MX records, I had to change the destination to "mail.'mydomain'.com". The 'mydomain' is my actual domain name in that example. There wasn't a "mail." in front of it and I guess Comcast didn't like that.

Go Daddy tech support helped out, only after I insisted different times I didn't need to renew my domains or needed any additional upgrades or services! lol. If you have a similar problem, I hope this helps.
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Edward PamiasTeam Lead RRS DeskCommented:
Author resolved his own question.
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