nostr:npub174t832slt4252dk526cnh64sfa3k6claah2cdl3c5n9eeeyvjz7q2fmqm6 In practice IPFS gateway URLs in emails are pretty much spam since real deployments will use better URLs, quite like how an IP addresses in an URL is likely to be spam. (spams being low-effort)

Remember that it assigns a spam-score, here a 6 but negative ones are also a thing when there's a good reputation.