...
Each group should be split into intervals of the last name. For example, a target audience that must be split into two groups will be split by the last name. The first group will contain recipients whose last name starts with letters between A-L while the second group will contain recipients whose last name starts with M-Z. (i.e. A-L, M-Z). A A blast can be sent to one group every 30 minutes. This ensures the even distribution of domains in each email, so they are not marked as spam.
Once the emails are chunked (perhaps by alphabet or another value), you want to sort them by the last name to ensure randomization of the domain.
Time Your Emails Right
Studies show that emails sent out between Tuesday-Thursday from 9-11 am, as well as 1-3 pm, generally return higher open rates. Planning your campaigns accordingly can lead to optimal email metrics.
...