What is Warmup?
The warmup is one of the best email practices, in which you are requested to send emails at a controlled speed. You might be thinking why?
The reason has been, as you’re sending emails from a new email service provider (ESP) so sending too much email to ISPs or mailbox providers from these new set of IP addresses from where your sender domain has never sent any email in past will look suspicious to the anti-spam filters.
Learn more about Automated IP warmup.