I might be wrong about this, but this is my take on it. It could be a spammer, sending out emails to test, if the accounts are active. You open the email, and there is a small little image the size of a pixel inserted in the email, once loaded, this will notify the spammer that the email account is in fact active, then they can know to send spam to you. As for Safari not loading, this might be a separate issue, do you got anymore info for us?