The unified auth + inter-app permissions are the real differentiator vs Coolify/CapRover-style container hosts. Data tiers (local DBs vs S3/R2 archive) also look like the practical way to make Immich/Jellyfin viable without giant managed disks.
These are self-hosted clients... It's a web interface for multi-mail (many accounts) not tied to one provider. This is not about hosting a DIY mail server.
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