I want to host an SMS application on GAE and all my traffic will come
from a SMS GATEWAY with a single IP address.

My users send queries through SMS which will be routed to my app from
SMS GATEWAY(single IP address).
My app processes those queries and reply back through SMS (again
through SMS GATEWAY).
I can reply using URL FETCH(not a problem) but what i'm worried about
is if I receive some 500 dynamic requests/sec from single IP address ,
GAE might block them thinking them as Dos(denial of service) attack .

GAE either asks the user to enter a captcha at
https://www.google.com/accounts/DisplayUnlockCaptcha or redirects to
sorry.google.com and displays an error message itseems if it receives
unusual traffic from single IP . But my users access app only through
SMS.

Please look at the production issue filed below :

http://code.google.com/p/googleappengine/issues/detail?id=5239&q=dos&colspec=ID%20Type%20Component%20Status%20Stars%20Summary%20Language%20Priority%20Owner%20Log

Has anyone hosted a similar app before ?

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