Why Warm Email Accounts?
Cold email accounts are only used to send marketing emails to people, they are not used to communicate on a personal basis. A standard email account (like you might have at home or work) is used to communicate with friends, family, colleagues, service providers, etc. usually in a 2-way communication.
Email Service Providers (ESP’s) monitor the domains and IP addresses of emails being sent to their customers. If automated system checks (or user feedback) determine that the emails are spam (or otherwise negative in nature), the ESP’s can restrict or block the emails from being delivered to the customers.
The SPF, DKIM and DMARC configuration we did earlier helps prevent this, but does not stop it.
Warming of email accounts is a fully automated process that simulates the real-world sending and receiving of emails, to make it appear that the email accounts are being used by humans, not for mass-marketing.