Emails not arriving in own domain

Hi,

I have successfully used Contact 7 on different sites.
In this case the From email is set to an easelecmech.com address
The To Email has multiple addresses – 2 from easelecmech.com and one from my domain annavalleyits.com.
I receive the email in my domain but it is not arriving in the easelecmech.com domain.
Our email MX records are hosted on our ISP server, but the records direct the emails first to Bitdefender, then to our Azure/365 Email Server.
We have Email Security from Bitdefender running and it is not flagging any emails received as rejected. They are just not being seen.
Any ideas about how to track down the problem would be gratefully received.

Andy

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