i use my iCloud email as my main email account and I haven’t been able to receive any emails since 6/10. I am not sure what else to do
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See these articles https://support.apple.com/en-in/HT203528
If storage is full mails will not be received , you have to reduce the iCloud storage space https://support.apple.com/guide/icloud/check-email-storage-mm6b1a4239/icloud
https://support.apple.com/guide/icloud/if-your-icloud-mailbox-is-full-mm6b1a5aee/icloud
Make sure you have not created rules in iCloud.com to move the mails https://support.apple.com/en-in/guide/icloud/mm6b1a3b04/icloud