feat: add Gmail sent email folder

GitOrigin-RevId: 20d68276607782f3003daef5eb30b04b47c6fa3c
diff --git a/private_dot_config/mutt/muttrc.tmpl b/private_dot_config/mutt/muttrc.tmpl
index ae4c91c..ba62ab3 100644
--- a/private_dot_config/mutt/muttrc.tmpl
+++ b/private_dot_config/mutt/muttrc.tmpl
@@ -20,6 +20,6 @@
 # Always quote the message when replying
 set include = "yes"
 
-mailboxes +Inbox +[Gmail]/Drafts
+mailboxes +Inbox +[Gmail]/Drafts "+[Gmail]/Sent Mail"
 # The alternates configuration is not available in dotfiles-external either,
 # sorry.