Best way to create batches of emails
Currently we have 300,000 marketable email addresses in our Marketo Instance. We would like to send email to them but in batches.
For example first we send to 50,000 users and then we send next email to those + another 50,000 users.
What is the best way to do this? Shall we create batches in random? Or what is the best and simple way to do that.