On Wed, 11 Jun 2014 16:44:28 +0100, John Hardin <[email protected]> wrote:
I just came across a PayPal phish that has a potentially useful indicator: the domain referenced in the URI has no MX record defined, so it cannot accept email.
MX records aren't required for mail deliverability. Unusual these days, but not required.
http://tools.ietf.org/html/rfc5321#section-5.1
