I have a client who uses DH who periodically sends out emails to their clients (who sign up on paper and these fields are added in a secure back end) and I have a queueing system setup so instead of sending out hundreds of emails at once, it will queue them all and then send out 50 every minute. I have a cron job setup, and it worked with the few tests I ran, but now when the client goes to use it, they themselves are not getting the email.
Does DH block this? Is there a hard limit of emails / hour that I need to be aware of?
Any assistance would be greatly appreciated.