Not receiving some emails from e-Rewards

  I haven't received some emails from e-Rewards after December 1, 2020.  Nothing in my inbox or spam folder.

  An email from e-Rewards customer service, erewardsusa@mailmw.custhelp.com, was received.  e-Rewards deactivated my account as they received a "hard bounce" to emails sent from erewards@e-rewards.net.  They asked me to check my email filters.  I don't have any email filters, so the emails are apparently being blocked by Comcast.

  Can anyone help with this?