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+
+NIP-101
+======
+
+Mailing lists
+-------------
+
+`final` `optional` `author:KaffinPX`
+
+Mailing lists are subscriptions for receiving materials from inviduals or organizations, `kind 1923` can be used for subscribing to mailing lists owned by an user.
+
+`tags` MUST contain an entry identifying the invidiual or organization subscribing to, in the form of `["p", "<pubkey, as a hex string>"]`.
+
+The `content` MUST contain a valid e-mail address encrypted by same method of encrypted direct messages(NIP-04) for subscribed pubkey.
+
+`tags` MAY contain an entry identifying the topic subscribing to, in the form of `["t", "<topic>"]`.
+
+**As example:**
+
+```json
+{
+  "kind": 1923,
+  "tags": [
+    ["p", <pubkey>],
+    ["t", "nostr"]
+  ],
+  "content": <encrypted example@test.com>,
+  ...
+}
+```
+
+After that, invidual or organization can fetch, filter, decrypt and check events for subscribed e-mail addresses.  
+Can be unsubscribed from mailing lists by event deletion(NIP-09).