GitLab CE 13.10.3 self managed on Azure not sending confirmation/reset mail

GitLab CE 13.10.3 self managed on Azure installed from Azure Marketplace GitLab Server Ubuntu preinstalled image.
GetLab smtp configured as per…

outbound smtp ports (including 587) enabled on Azure VM

Some email is working as Admin gets email to authorize sign-up as per admin settings.
However if the Admin tries to force confirmation, that email does not go out.
Also on login, forgot email password rest email does not go out.
Are there any diagnostics/logs to help figure this out? Any Ideas?
Thanks for any help.