Get CDOSYS Mail working for Classic asp web application running on Windows Server 2019

I have a Classic ASP/SQL Server Express application that currently runs on Windows Server 2012. I want to migrate this to Windows Server 2019. I have managed to perform the operating system and SQL server upgrades but the asp pages send emails using CDOSYS. This fails on the Windows Server 2019.

I need someone with experience of both Windows Server environments and CDOSYS/Mail transport to instruct me on how to get this working.