Description of Problem:

The "VM" mail package for use within XEmacs is not included
by default in the XEmacs variable
"toolbar-mail-commands-alist", although VM is included in as
part of the XEmacs distribution. This prevents the toolbar
"Mail" button being configured to invoke VM using the documented
method of setting the variable "toolbar-mail-reader".

Version-Release number of selected component (if applicable):
XEmacs 21.4
VM 7.0

How Reproducible:

Execute Emacs-lisp expression
(setq toolbar-mail-reader 'vm)
to set the "toolbar-mail-reader" variable, then click the toolbar
Mail button.

Steps to Reproduce:

1. Add the line
(setq toolbar-mail-reader 'vm)
to ~/.xemacs/init.el

2. Start XEmacs
3. Click the toolbar Mail button

Actual Results:

"Uknown mail reader vm", message in XEmacs modeline.

Expected Results:

VM should be started.

Additional Information:

In the error message, there's a typo in "Uknown".