Resolve "add smtp relay"

Closes #31 (closed)

defaults/main.yml

@@ -36,11 +36,16 @@ ynh_users: null
   #   lastname: Doe
   #   mail_domain: domain.tld
 
+# Do not touch this variable
+# Just to have dict default value
+ynh_smtp_relay:
+  value: null
+
 # SMTP custom settings (Only override if you need a SMTP relay)
-ynh_new_smtp_relay:
-    value: null # Do you touch this variable
+# Example:
+# ynh_smtp_relay:
     # host: smtp.domain.tld
-    # port: 25
+    # port: "25"
     # user: user1
     # password: Pa$$w0rd