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All 11 deliverability 10 sending 4 warmup 3 policy 2 open-source 1
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deliverabilitysending 8 min read

An open source cold email and warmup platform: what self-hosting actually gives you

Warmbly is Apache 2.0 cold email plus warmup you can self-host. What running it yourself means for IPs, workers, and your data, and when cloud is the better call.

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