diff --git a/status-whisper-mailserver-spec.md b/status-whisper-mailserver-spec.md
index a7e0c13..65c7d59 100644
--- a/status-whisper-mailserver-spec.md
+++ b/status-whisper-mailserver-spec.md
@@ -17,10 +17,14 @@ TBD.
 
 In the case of mobile clients which are often offline, there is a strong need to have an ability to download offline messages. By offline messages, we mean messages sent into the Whisper network and expired before being collected by the recipient. A message stays in the Whisper network for a duration specified as `TTL` (time-to-live) property.
 
+See [EIP-627](https://eips.ethereum.org/EIPS/eip-627) for more detail on *Whisper Mail Server* and *Whisper Mail Client*.
+
 ## Mailserver
 
 A mailserver can either be running as a server or as a client.
 
+Since Whisper is a form of DHT, a mailserver only requires a specific relationship with the receiver of a message, not with the sender of a message.
+
 ### Server
 
 <!-- TODO: This doesn't actually describe how to implement a mailserver -->
@@ -63,4 +67,6 @@ In order to use a mail server, a given node needs to connect to it directly, i.e
 
 ### Denial-of-service
 
+Since a mailserver is delivering expired envelopes.
+
 TBD.