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Yes, it’s possible, that’s similar to my current setup. Mailcow in my homelab, but sending through a service called Postmark. It was better when Postmark had a credit based system, $1 for 1000 credits (sent emails). They’ve recently switched to a subscription model that is like $10-15 / mo. I find it works really well.
Proxmox is a fantastic option. Let me know if you ever need any help with the setup. Learning new tech options, trying out new things is always something I enjoy doing. Even failing through things is invaluable. Best of luck with your setup.