Rate limiting improvmx

[wilco375]

Currently the rate limiting of SMTP (moderated) mails is set to one per day (

amber-api/app/controllers/v1/stored_mails_controller.rb

Line 26 in 1c19909

def check_improvmx_limit

). However, we can send 200 mails per day, so e.g. a moderated mail to 30 people should not block another moderated mail to 120 people. So ideally, the limit is based on how many people have been emailed so far, and to how many the mail being moderated has to be sent.