What build are you running in Acumatica? I always thought your email and mail domain had to match. I see you are with GoDaddy is your domain provider. Maybe this site can help isolate your problem. https://mxtoolbox.com/domain/fusionimaging.com/?source=findmonitors
In the test tenant, make sure the Automation Schedule for send and receive emails is not active. As you wouldn't want emails from your test system going out. Possibly check how often both are sending and receiving. I have setup in mult production tenants without issue. 360/Google. You have to add to Server and Advanced. Enter user and password. Sorry hope this helps. Matt
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