There is a huge problem in email called phishing. This is where a scam email is sent to someone in attempts of that person giving up a login and password or worst yet actual money att.net. Most phishing emails are designed to look exactly like the service, bank, or organization that you used to receiving email from. The concept is that you are more likely to open email from these types of services that you are used to receiving email from meaning you are more likely to fall for the phishing scheme.