Move Mail Delay to a Environment Variable
Description
Currently, we have a rate limit when sending mails, by our provider. The Limit is Hard-coded in MailsControl.php. It should be moved to an Environment variable, that we can change it, when we get a lower rate limit
Goal
Make our code ready for higher mail throughput
Solution
Just move DELAY_MICRO_SECONDS_BETWEEN_MAILS
to a Environment Variable in the Config.
Here it is set for beta and production