Added missing file for special mailbox configuration

roles/ispmail-dovecot/files/15-mailboxes.conf

@@ -0,0 +1,50 @@
+##
+## Mailbox definitions
+##
+
+# NOTE: Assumes "namespace inbox" has been defined in 10-mail.conf.
+namespace inbox {
+
+  #mailbox name {
+    # auto=create will automatically create this mailbox.
+    # auto=subscribe will both create and subscribe to the mailbox.
+    #auto = no
+
+    # Space separated list of IMAP SPECIAL-USE attributes as specified by
+    # RFC 6154: \All \Archive \Drafts \Flagged \Junk \Sent \Trash
+    #special_use =
+  #}
+
+  # These mailboxes are widely used and could perhaps be created automatically:
+  #mailbox Drafts {
+  #  special_use = \Drafts
+  #}
+  mailbox INBOX.Junk {
+    auto = subscribe
+    special_use = \Junk
+  }
+  mailbox INBOX.Trash {
+    auto = subscribe
+    special_use = \Trash
+  }
+
+
+  # For \Sent mailboxes there are two widely used names. We'll mark both of
+  # them as \Sent. User typically deletes one of them if duplicates are created.
+  mailbox INBOX.Sent {
+    special_use = \Sent
+  }
+  #mailbox "Sent Messages" {
+  #  special_use = \Sent
+  #}
+
+  # If you have a virtual "All messages" mailbox:
+  #mailbox virtual/All {
+  #  special_use = \All
+  #}
+
+  # If you have a virtual "Flagged" mailbox:
+  #mailbox virtual/Flagged {
+  #  special_use = \Flagged
+  #}
+}