diff --git a/mozilla/mailnews/mailnews.js b/mozilla/mailnews/mailnews.js
index a310632d1aa..d53e16da16f 100644
--- a/mozilla/mailnews/mailnews.js
+++ b/mozilla/mailnews/mailnews.js
@@ -349,3 +349,4 @@ pref("mail.identity.default.compose_html", true);
 pref("mail.update_compose_title_as_you_type", true);
 
 pref("mail.collect_email_address", true);
+pref("mail.default_sendlater_uri","mailbox://nobody@Local Mail/Unsent Messages");
diff --git a/mozilla/modules/libpref/src/init/mailnews.js b/mozilla/modules/libpref/src/init/mailnews.js
index a310632d1aa..d53e16da16f 100644
--- a/mozilla/modules/libpref/src/init/mailnews.js
+++ b/mozilla/modules/libpref/src/init/mailnews.js
@@ -349,3 +349,4 @@ pref("mail.identity.default.compose_html", true);
 pref("mail.update_compose_title_as_you_type", true);
 
 pref("mail.collect_email_address", true);
+pref("mail.default_sendlater_uri","mailbox://nobody@Local Mail/Unsent Messages");