With my extensive background in IT and cloud computing, including numerous Azure certifications you can be confident I'll not only successfully set up your Let's Encrypt SSL certificate to ensure secure connections on your Exchange 2019 Server, but I'll do so with the proficiency specific to Microsoft Exchange and Azure that you require for this work.
My previous projects have involved configuring SSL certificates using Let's Encrypt on a variety of platforms, including Windows servers. My experience extends beyond server configuration to aspects like DNS and domain name configuration as well. This experience will be incredibly valuable in ensuring a smooth integration with the existing setup you've outlined.
Above all, my aim is always to prioritize security and enhance system performance. By entrusting your project to me, not only will you benefit from my expertise in SSL configurations but also from my overall knowledge of IT operations, networking, security and more that will help me foresee any potential issues. Consider hiring me for this project and let's establish a reliable, encrypted environment for your email communications together.