Can't send mail after upgrade to 14.6.2

Good morning folks,

Having an issue after upgrading from 13.x.x to 14.6.2. The ability to email users was working fine under 13.x.x but once we made the upgrade to 14.6.2 we can no longer send mail. Previously on 13.x.x we were using Ubuntu Xenial and to upgrade to 14, we had to upgrade our AWS instance to 18.04 Bionic. Is this part of the issue? Here is the result when I try to send an email test using the gitlab-rails console:

Bumping this one for any thoughts or ideas.