Q: Why Apple is blocking email from reaching my mac email account that I would like to receive.  How do I correct this?

Hey there MikeMach,

It sounds like people are sending you emails but they never arrive to your inbox or your Junk folder. According to the following article you may need to reach out to iCloud support directly for assistance:

iCloud: Identifying and filtering junk mail

Due to the complexity of accurately detecting and filtering out junk mail, on rare occasions a legitimate email from a friendly source may be blocked from reaching your Inbox. This is called a false positive.

If you feel that a legitimate email message was inadvertently filtered, you may want to ask your friend to send a follow-up email to verify that the issue exists. If you notice that multiple email messages are being delayed, bounced, or not delivered, contact iCloud Support. Also make sure to check your Junk folder for email messages that were incorrectly marked as junk mail. To check your Junk folder at iCloud.com, choose the Mail application and click the Junk folder in the sidebar. Email messages in the Junk folder are automatically deleted after 30 days.

Thank you for using Apple Support Communities.

Take care,

Sterling