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With apple you’re limited to 5 sending addresses per domain, so no I cannot reply as the from address to most, but that hasn’t been an issue for me at all.

I’m fairly certain he’s at least somewhat relying on YouTube monetization so I’m not sure what the incentive would be to also upload on PeerTube?

Depends on your use case. I went with using a custom domain with my iCloud mail account. This lets me accept all messages sent to my custom domain.

So when I create accounts I just use that as the email address like this: [email protected], [email protected], etc.

They all go to one mailbox but that’s all I need anyway. I’ve been happy with it.