Sorry that I create this issue for the bug tracker, but this is sort-of an integrative issue.
When some port maintained by the user gets broken and gets quickly labeled as 'BROKEN', maintainer of this port gets no notification about this. For example, 6 months ago the port graphics/vv, maintained by me, was broken by a dependency library name change and got labeled BROKEN, and I had no idea before I accidentally noticed its name added to /usr/ports/MOVED when it was deleted after being broken for 6 months.
When the system queries for open PRs by the user, and decides to send the e-mail "Problems that need special attention", broken ports maintained by the user should be added to the list of items it queries for and notifies users about.
This way such notifications would just integrate into the existing process, and this would solve the problem of maintainers being informed about broken ports.