Cox.net is blocking my incoming e-mail.

My personal e-mail that I use is being blocked and deleted before getting onto my cox e-mail server.  My wife who use the same same business e-mail and server for personal use can send e-mail to friends, family etc. to people with e-mail @Cox.net.  The only difference between our e-mails is it has her name vs my name @OurCompnay for the e-mail

I can send out a e-mail list for a club meeting etc. every one on the club list will get the e-mail but the people that use  e-mail @Cox.Net.  I can send the same e-mail from my wife e-mail  and every one will get the e-mail.  So why is Cox.net specifically blocking incoming e-mail from me person business e-mail address.