SMS blockage by carriers

[Brad Chick]

We are in the process of evaluating Kannel for our SMS needs. In the past, 
we have used ordinary SMTP messages sent via email to deliver messages. A 
big problem we run into is that certain carriers (e.g. Nextel, US Cellular) 
have threshold blockage rules, such that if we send too many messages in a 
small amount of time, they just block them.

I'm hoping that Kannel will eliminate the problem.
All of our messages are legitimate. We provide messaging services for major 
marathons and need to push out hundreds of thousands of messages during a 
4-5 hour period.

Thanks