Most likely Mail is going to SPAM, Mail is defiantly getting sent, In your logs you see 250: 2.0.0 Ok: queued as which means the Mail Server you are sending Mail too has accepted the Mail.
Do you have DMARC, DKIM, SPF implemented, have you implemented PTR Record that matches the hostname & IP of the Mail Server?
DMARC1, DKIM, SPF, PTR all configured I will up load my mx-toolbox report as soon as I get a chance. Thanks in advance for your time and assistance.
