When warming up your email domains, it's essential to follow a gradual and cautious approach to establish a positive reputation with email service providers and maximize deliverability. While there isn't a fixed duration that universally applies to all domains, we generally recommend warming up your email domains for approximately 14 days.
This is because sending a high volume of emails from a newly configured domain can trigger spam filters; therefore, creating problems in terms of deliverability. Even the most meticulously planned email campaigns can suffer from low open and reply rates if they end up flagged as spam. Email warm-up is specifically designed to enhance deliverability, safeguarding your sender reputation and ensuring your messages reach their intended recipients.
Here's a video explaining what email "Warm Up" is in a bit more detail:
