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Very low for one person with a few emails per day. They almost never appear in top on a 3€/month VPS server (2 vCPU, 2G RAM).

They probably work well on quite limited hardware. But I guess it largely depends on traffic / on the number of hosted users.



Doesn’t even need that. I’ve run pretty much that stack on an original Raspberry Pi. You wouldn’t want to be trying to do a lot else, and GB sized attachments are gonna be limited by the usb Ethernet speed, but it’ll run just fine.




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