Our domain (innovativecg.com) is unable to receive mail from infirmaryhealth.org.
The sender does not receive an NDR.
We are able to send to them without issue.
Our MX Records have been verified. (and allow all other domains to correctly route to us)
The Remote Connectivity Analyzer shows all green.
In my Receive Connector logs, I can't find anything received from infirmaryhealth.org.
My firewall is correctly configured to allow all mail to be forwarded to our exchange server.
Venture(infirmaryhealth.org's hosted provider) is stating that 23 emails left their domain destined for our servers yesterday.
We have GFI MailEssentials installed on our server, but it is disabled during troubleshooting currently.