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?
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.
What are you running for email on your side, and do you have SPF records in place?
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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