gnus: nnmaildir (maildir) with with subfolders tree

Question

I have configured gnus to use nnmaildir with ~/Maildir directory. Gnus sees/lists maildirs in direct sub-folders (e.g. ~/Maildir/archvives/) but it does not see/lists maildirs in deeper subfolders e.g. (~/Maildir/archives/2015/).

How to fix it?

Answer 1

I have configured nnmaildir to use ~/Mail directory. I have created softlinks in the ~/Mail directory to selected maildir folders in ~/Maildir (tree of maildir directories)'
e.g. ~/Mail/XX-YY -> ~/Maildir/XX/YY

'(gnus-secondary-select-methods
   (quote
    ((nnmaildir "" (directory "~/Mail")))))

https://www.gnu.org/software/emacs/manual/html_node/gnus/Maildir.html

Virtual server settings:
directory
For each of your nnmaildir servers (it’s very unlikely that you’d need more than one), you need to create a directory and populate it with maildirs or symlinks to maildirs [...]