Gmail -- new folders

[Rob Pyott]

Hello, I have Mutt working nicely with Gmail.  Issue is that Mutt causes to folders, [Imap]/sent-mail and saved-messages, to be created on the server.  There isn't anything in these folders.  Should I try to configure so that these do not appear?  I have a simple muttrc (welcome tips):

set from = "arpyott at gmail.com"
set realname = "Rob Pyott"

# IMAP settings
set imap_user = "arpyott at gmail.com"
set imap_pass = xxxxxxxxxxxxxxxx

set sort = "threads"

set sendmail = "/usr/local/bin/msmtp -a gmail"

set folder = "imaps://imap.gmail.com:993"
set spoolfile = "+INBOX"
set postponed = "+[Gmail]/Drafts"
set header_cache = "/Users/albertpyott/.mutt/cache/headers"
set message_cachedir = "/Users/albertpyott/.mutt/cache/bodies"

set mbox_type = Maildir

set editor = "vim" 

The msmtprc is:

account gmail  
host smtp.gmail.com
port 465
protocol smtp
auth on
user arpyott at gmail.com
from arpyott at gmail.com
tls on
tls_starttls off
tls_trust_file /Users/albertpyott/certs/certificates.pem