Capture SMPT responses?

Is there a way to capture the smpt email server responses when sending SMPT email? We have office 365 email, and in my application I am sending email to various customers from a list. When I send the email I get no errors or issues, but the emails are never delivered. I am having our network engineer read through the log files on our firewall filter and on the office 365 admin console, but it would be helpful if I could capture any messages back and try to handle them naturally. For example if address not found is returned I could capture it and mark the account for verification in our system. Any thoughts? 
Thank you
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