We have an alert system as well for our city and simply requested our quota 
to be raised. Here is the FAQ: 
https://developers.google.com/appengine/docs/quotas#Mail 

Increasing your daily mail quota
> When you enable billing, the email quota remains at 100 messages per day. 
> You must explicitly request a higher mail quota. Go to the*Quota Details* 
> page 
> of the Admin Console and scroll to the *Mail* section. There you'll find 
> a link to submit a request for additional email quota. After you submit the 
> request you can monitor its status by visiting the same link again. This 
> will display a page that shows the status of the request: whether the 
> request has been granted, is under review, or has been denied. If the 
> request is granted it may be several minutes before the new quota of 20,000 
> messages per day takes effect. If the request is denied you cannot make 
> another request to increase mail quota until some time has passed.
> If your app will need to send more than 20,000 messages per day, consider 
> signing up for a premier account 
> <https://developers.google.com/appengine/docs/premier/>.


Not sure if that answers your question or not? Good luck. 

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