- The process of gradually establishing and improving the reputation of a new or dormant email address or domain with email service providers (ESPs) and spam filters to ensure reliable inbox delivery. Email warm-up involves systematically sending increasing volumes of emails to engaged recipients over a period of days or weeks, starting with small batches to high-engagement contacts and progressively scaling up while monitoring deliverability metrics. It is considered essential for new email marketing campaigns, cold outreach, or when switching email providers, as it helps avoid spam folder placement and maintains sender reputation scores that directly impact email deliverability rates.
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