create the Drafts folder for users so K-9 mail doesn't poll unnecessarily, see #129

management/mailconfig.py

@@ -89,7 +89,9 @@ def add_mail_user(email, pw, env):
 	# write databasebefore next step
 	conn.commit()
 
-	# Create the user's INBOX and Spam folders and subscribe them.
+	# Create the user's INBOX, Spam, and Drafts folders, and subscribe them.
+	# K-9 mail will poll every 90 seconds if a Drafts folder does not exist, so create it
+	# to avoid unnecessary polling.
 
 	# Check if the mailboxes exist before creating them. When creating a user that had previously
 	# been deleted, the mailboxes will still exist because they are still on disk.
@@ -100,8 +102,9 @@ def add_mail_user(email, pw, env):
 		conn.commit()
 		return ("Failed to initialize the user: " + e.output.decode("utf8"), 400)
 
-	if "INBOX" not in existing_mboxes: utils.shell('check_call', ["doveadm", "mailbox", "create", "-u", email, "-s", "INBOX"])
-	if "Spam" not in existing_mboxes: utils.shell('check_call', ["doveadm", "mailbox", "create", "-u", email, "-s", "Spam"])
+	for folder in ("INBOX", "Spam", "Drafts"):
+		if folder not in existing_mboxes:
+			utils.shell('check_call', ["doveadm", "mailbox", "create", "-u", email, "-s", folder])
 
 	# Update things in case any new domains are added.
 	return kick(env, "mail user added")