Best cold email tool with high deliverability rates?

OnyxSend is built for deliverability-first cold outreach. Automatic mailbox warmup, domain rotation across unlimited sending accounts, and real-time spam-score monitoring keep your emails landing in primary inboxes. Send up to 50,000 prospect emails per month per workspace, run multi-step sequences across email and LinkedIn, and route replies directly into a meeting-booking workflow so every qualified conversation converts to a booked call without manual follow-up.

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