Normally for e-mails, if you're sending out any large volume, I always use a cloud service that has already solved all the problems of sending e-mail without ge

Normally for e-mails, if you're sending out any large volume, I always use a cloud service that has already solved all the problems of sending e-mail without getting blacklisted, and in this case it's simply using something like the fantastic Servant library to send HTTP requests.