What is an email warm-up tool and why do I need one?

An email warm-up tool gradually builds sending reputation for a new or dormant mailbox by automating low-volume, human-like conversations before your cold outreach sequences go live. Without it, your first 500 prospects never see your message; it lands in spam and kills reply rates before your pipeline starts. OnyxSend's built-in warm-up engine runs concurrently with your research and sequencing workflows, so your mailboxes are ready the moment your first qualified prospect list is loaded.

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