Near the end of the page, text states "An A> record is not needed..." The > appears to be stray markup. The same page states "All mail sent to example.FreeBSD.org will be collected on hub under the same username instead of being sent directly to your host." The word hub only occurs in that one spot. I suspect hub should have been replaced with nevdull.FreeBSD.org.
A commit references this bug: Author: ale Date: Mon Oct 26 09:15:59 UTC 2020 New revision: 54632 URL: https://svnweb.freebsd.org/changeset/doc/54632 Log: Remove an extraneous '>' character. PR: 250618 Submitted by: Brian Haug <haug.bsd6114@yahoo.com> Changes: head/en_US.ISO8859-1/books/handbook/mail/chapter.xml