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Case study
Parabola
Parallel outbound + Customer.io during hypergrowth
Parabola needed cold outbound to scale during a hypergrowth phase — in parallel with heavy Customer.io lifecycle email — without either side degrading the other.
Parabola is a data-automation SaaS that grew fast. During hypergrowth, both marketing email through Customer.io and cold outbound needed to scale simultaneously — and the usual risk is that one channel's sending behavior bleeds into the other's reputation.
We kept them cleanly separated. Cold outbound ran on dedicated subdomains and IPs, authenticated independently of their lifecycle stack, with its own monitoring. Customer.io continued to handle lifecycle email unaffected. Both scaled together without either channel inheriting the other's reputation risk.
If anyone understands the power of smart automation, that's our team. After all, we built Parabola to help other organizations streamline their most time-consuming, tedious processes. We knew that cold email would be a strong addition to our outreach efforts and it could help us reach more people — if done right. So instead of putting it on all our plates, we found Senders. Their deliverability and infrastructure serve as the base of our email outreach, making sure it's as safe as it is effective.
Parabola
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