Didn't look into it, but if it's nostr to nostr, (not a bridge from traditional email to nostr), and seems fine structure wise, then sure, otherwise probably not.
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Here's the link to the NIPs they use: 
Also is there any way I could get PR access? I'd like to contribute to this.
Nostr Mail | The Open Protocol for Decentralized Email
The open, sovereign and decentralized email protocol powered by Nostr. Own your identity and inbox without central authorities or gatekeepers.