1) OTA = Over The Air
2) Quick fix: You can set a rule or filter on the blackberry account. Log on to your carriers blackberry account.
a) Select "filters" on the account is doing this
b) Select "Add Filter"
c) On the filter name, choose any name you want
d) On the "Apply filter when" field, select "From" field
e) On the "contains" field, put your email adress
f) Select "Do not forward messages to handheld" and click save