Domain warming is the process of preparing email servers to accept email from a new or little-used email domain. This usually involves sending a series of test emails to the new domain to make sure that it is properly configured to receive email. Domain warming can help prevent email deliverability problems when a new email domain is launched. There are several steps that can be taken during domain warming: 1) Verify DNS settings: Make sure that the new email domain has proper DNS settings for mail exchange (MX) and sender policy framework (SPF). These settings need to be in place before email can be delivered to the new domain. 2) Send test emails: Once the DNS settings are verified, start sending test emails to the new email domain. This will help identify any potential email deliverability problems. 3) Monitor email delivery: closely monitor email delivery to the new email domain. This will help identify any potential deliverability problems so that they can be fixed before launching the new email domain. 4) Launch the new email domain: Once all of the above steps have been completed, the new email domain can be launched.