@wearehackerone.com is vulnerable to namespace attacks due to hackerone.com not being RFC2142 compliant.

First off, I know RFCs are annoying. Second of all, namespace attacks are a b*tch.

MAILBOX        AREA                USAGE
-----------    ----------------    ---------------------------
ABUSE          Customer Relations  Inappropriate public behaviour
NOC            Network Operations  Network infrastructure
SECURITY       Network Security    Security bulletins or queries