You can probably send an SMS message without a data plan... but not to just any e-mail address. You can send an SMS message to an SMS recipient... i.e... another mobile device.
I've never heard of piping a normal e-mail over SMS.
well ive doen it form a callphone, the only problem is that with a bb i cant type the @ symbol anywhere in the phone number fileds, if i was able to there would be no problem.
Look... I don't give a crap if you sent a regular e-mail with your refrigerator in your kitchen. If you don't have a Blackberry Data Plan, you aren't sending or receiving any e-mail with your Blackberry.
In Germany some providers provide an "Email-Gateway" you send a sms with the recipients email-adress and subject and the email-body to a specific Number and it will be sent.... Check with your provider...