It's alarming that Mt. Gox doesn't even have SPF setup.
If email phishing is frequent, they should use SPF record to tell email service providers to reject all emails not from their IPs. This method is not fool-proof but at least most emails can go to spam instead of entering the inbox.
*.mtgox.com CNAME 10 minutes
www.mtgox.commtgox.com A 10 minutes 72.52.5.67 (Hollywood, FL, US)
mtgox.com MX 10 minutes 1 aspmx.l.google.com
mtgox.com MX 10 minutes 5 alt1.aspmx.l.google.com
mtgox.com MX 10 minutes 5 alt2.aspmx.l.google.com
mtgox.com MX 10 minutes 10 aspmx2.googlemail.com
mtgox.com MX 10 minutes 10 aspmx3.googlemail.com
mtgox.com MX 10 minutes 10 aspmx4.googlemail.com
mtgox.com MX 10 minutes 10 aspmx5.googlemail.com
mtgox.com NS 10 minutes ns1.xta.net
mtgox.com NS 10 minutes ns2.xta.net
mtgox.com SOA 10 minutes ns1.xta.net. domains.tibanne.com. 2011030600 10800 3600 604800 3600
mtgox.com SOA 0 seconds ns1.xta.net. domains.tibanne.com. 2011030600 10800 3600 604800 3600
www.mtgox.com A 10 minutes 72.52.5.81 (Hollywood, FL, US)