I need a VPS for about 30–50 email accounts.

In terms of resources, I think 2–4 CPU cores / 4–8 GB RAM / 100 GB NVMe will be enough, but I want reliable backups and a stable network.

I’m looking at hostpro.com and a few European providers.

What’s more important for a mail server—the VPS specs or the provider’s IP reputation and network quality?