question about getmailrc

Hello,

Currently my getmailrc is

/[retriever]//
//type=SimpleIMAPSSLRetriever//
//server=outlook.office365.com//
//username=mylogin//
//password=mypw//
//
//[destination]//
//type=Maildir//
//path=/home/ml/Maildir///
//user=ml//
//
//[options]//
//verbose=2//
//read_all=False//
//delete=True//
//message_log= /home/ml/.getmail/log//
//message_log_verbose=true/

This gets me the content of my remote mailbox called "boîte de 
réception" in my local inbox.

I would like to also get the contents of the remote "courrier 
indésirable" in a local folder/"/home/ml/Maildir///.anteroom"/

If I add to/[retriever]/ a line

/mailboxes=("//boîte de réception",//"courrier indésirable",////)/

I assume I would recover the contents of the two remote mailxoxes in my 
local inbox, but how could I  get the contents of "courrier indésirable" 
in /"/home/ml/Maildir///.anteroom" ?/

/
/

/Thanks/

/
/

/Marc
///