Don't report new bugs for Rmail??

[Eli Zaretskii]

If you go to http://emacsbugs.donarmstrong.com/, make sure "package"
is checked in the "Find bugs by:" selector, type "rmail" into the
"What to search for:" field, and click the "Find" button, you will see
a page with the following on its 2nd line:

  There is no maintainer for rmail. Please do not report new bugs against this 
package.

??? Why does it ask not to report new bugs?