x11-plugins/
wmbiff

WMBiff is a dock applet for WindowMaker which can monitor up to 5 mailboxes

https://www.dockapps.net/wmbiff

There are no open security bugs.

You think something is missing here?
Start with filling a new security bug.

Please file new vulnerability reports on Gentoo Bugzilla and assign them to the Gentoo Security product and Vulnerabilities component.