Fixed #25178 -- Added DEFAULT_FROM_EMAIL to deployment checklist.

docs/howto/deployment/checklist.txt

@@ -131,9 +131,10 @@ If you haven't set up backups for your database, do it right now!
 
 If your site sends emails, these values need to be set correctly.
 
-By default, Django will send email from root@localhost. However, some mail
-providers reject all email from this address. To use a different sender
-address, modify the :setting:`SERVER_EMAIL` setting.
+By default, Django sends email from webmaster@localhost and root@localhost.
+However, some mail providers reject email from these addresses. To use
+different sender addresses, modify the :setting:`DEFAULT_FROM_EMAIL` and
+:setting:`SERVER_EMAIL` settings.
 
 :setting:`STATIC_ROOT` and :setting:`STATIC_URL`
 ------------------------------------------------