Today we noticed a Phishing scam mimicking Authorize.net email notifications. As with all suspicious email, prudence is critical.
A simple test can reveal a lot about a suspicious email: hover (do not click) your cursor over a hyperlink to see the actual URL "behind" the hyperlink. If the URL is inconsistent with the email context, then your are most likely the recipient of a phishing scam email.
Here is the notice provided by Authorize.net.