Dear AppEngine people (I understand that all AppEngine support has moved to StackOverflow - if I am mistaken then sorry for posting this here), I have a very serious problem tha
Per the billing FAQ's
Why did my mail quota not increase after I enabled billing?
Google will wait until the first payment is cleared before increasing your mail quota. This means it will take at least seven days to get the higher quota.
https://developers.google.com/appengine/kb/billing#quota_increase
DISCLAIMER - I am not affiliated with Google in any way, nor do I believe you can get an official response from them via stackoverflow.
GAE no longer supports sending more than 100 emails per day as per their tech support (May 2016). Instead they are nudging people over to SendGrid. Its unfortunate that they are reducing the capabilities of GAE for something as basic as transactional email. I can see why marketing or bulk emails would be frowned upon but for the core transactional emails most apps/sites require it would be nice to have a native, low cost, option. Off to check out Amazon's email service!