They don't need to be paid. The inbox is where you receive posts from other people. Public inbox is for replies, zaps, likes, etc to your posts. Private Inbox is for your DMs.

You want everybody to be able to download replies to your message, so your Public relay choice should allow that.

You don't want other users downloading your DMs, so your relay choice for the private inbox should also support that.

But you can put public relays in the Private inbox if you don't mind other people seeing the encrypted DMs going to you.

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Thanks, that helps. Another question, how have I been getting DMs all this time? I never used a special inbox relay before.

We use the General Relays as fall back. The messages are just scattered to all of them if you don't have an inbox list setup.

Ah, got it. Thanks for the help. It's really hard to find this info out there in the wild through web searches, etc. I've found a little on relays in general, but nothing on all the types and how they work with different kinds of notes. Your descriptions are the best I've seen so far.

Yeah, this is all very new and many of them have yet to classify themselves into any of these categories.