Can't you use filters on the phone's e-mail, such as setting up the phone to automatically delete anything that doesn't have [phrase x] in the subject line?
Listen up. You have two choices. A. Beaten then caught. Or B. Caught then beaten. -Kuga Kohtarou, Shikigami no Shiro II
There are anti-phising filters you can set up too for your phone. I get zero spam as I have this filter. There are other filters that just block non-phone email addresses but that is a real pain if you use your phone email address for more than just chatting with friends on their mobiles.
But my question is - when somebody gets an email that is out of character with the usual tone from the sender - why doesn't the person call up or reply with a "WTF"? I mean if your friend sends you an out of character email, you ask them what it is all about don't you?