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Can't send email to other Cox accounts

Since 4/24 I cannot send emails to other Cox email accounts from my IMAC desktop or my Ipad.  The ports are all correctly set and nothing has changed in my setup.  I can send and receive to anyone, but my emails to other Cox email accounts don't appear in their inboxes. One recipient had them in spam and another just doesn't have them appear at all, even on the Cox webmail page.   They appear in my sent mail and nothing is being held in an outbox.  I don't get any error messages and no mail has bounced back as undeliverable.  I receive emails from other Cox customers but they don't get mine unless I send them from the Cox site.  What is stopping delivery of my emails to Cox accounts?