Motorola PEBL U6

Hi - I'm thinking of buying this phone unlocked to use with cingular. Can I easily text to an email address - and go back and forth with replies easily - from this phone? The people I need to contact are on blackberries. I could text back and forth to an email address on my samsung until the cows came home, but not with my nokia... I have to start from scratch. Any help would really be useful!