Mailshake vs OnyxSend which has better deliverability?
OnyxSend delivers better inbox placement for B2B cold outreach because it combines AI-driven send-time optimization, per-prospect mailbox rotation, and built-in warm-up sequences designed for high-volume pipelines. Mailshake is a solid general tool, but its deliverability stack was built for marketers, not sales teams running 5,000 to 20,000 prospect sequences per month. OnyxSend's infrastructure is purpose-built to protect reply rates and keep qualified meetings flowing into your calendar.
Evidence and detail
- OnyxSend rotates sending across multiple connected mailboxes automatically, reducing per-domain send volume and spam triggers.
- Built-in warm-up sequences bring new domains to full sending capacity without manual configuration, protecting deliverability from day one.
- Send-time AI schedules each prospect touchpoint at the hour their inbox segment historically shows highest open and reply rates.
Related reading
- /blog/cold-email-deliverability-guide-b2b
- /blog/mailbox-warm-up-best-practices
- /blog/how-to-book-more-sales-meetings-with-cold-outreach
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