Clarify "free" in cases that mean gratis by using "free of cost"

1 files changed, 5 insertions, 3 deletions

diff --git a/email2.md b/email2.md
index 3b5fc53..c807871 100644
--- a/email2.md
+++ b/email2.md
@@ -137,15 +137,17 @@ system.
 The reason current email has a spam problem is three-fold:
 
 * anyone can send email to anyone
-* sending any amount of email is basically free
+* sending any amount of email is basically free of cost
 * there are no real consequences from sending unwanted email, except
   for the sender's reputation
 
 What we want from the solution:
 
 * anyone can send email to anyone who wants to receive it
-* sending email should be basically free, if the recipient wants it
-* sending email without prior arrangement does not need to be free
+* sending email should be basically free of cost, if the recipient
+  wants it
+* sending email without prior arrangement does not need to be free of
+  cost
 
 A possible solution might be a kind of digital stamps.