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Cannot send emails from business domain to @comcast.net email accounts

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Cannot send emails from business domain to @comcast.net email accounts

Hello,
I am experiecing difficulties sending emails from my business mail server. The end-users from lennar.com are not having any success relaying emails to accounts using comcast.net.
Can you advise if there any suppression settings set on the lennar.com domain?
I have tried sending test emails from my business email to [edited for forums violation].net (my comcast acct) but it's not successful. 
I also attemtpted to delist our two static ip address for outbound mail flow, but I received the automated notification that neither ip address is on the block removal list.
I also performed a test message trace from Lennar's Proofpoint console and the communication was successful. I can provide the logs upon request.
Thank you.
Expert

Re: Cannot send emails from business domain to @comcast.net email accounts

Start by calling Comcast security to see if there are any blocking issues for that domain-------------------

 

Comcast Customer Security Assurance-------------------

Normal business hours (6:00 am to 2:00 am EST, 7 days a week)

1 - 888-565-4329



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