sending
4 posts
An open source cold email and warmup platform: what self-hosting actually gives you
Sendsets 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.
How many cold emails can you actually send per day?
The safe number is per mailbox, not per account: 50/day default, 100 hard max, a 600s gap between sends. Here is the math to plan any daily volume.
How many mailboxes and domains do you need for the volume you want?
Planning cold email volume comes down to per-mailbox budgets. Work backward from your daily target to the mailboxes, domains, and IP spread you actually need.
Your send limit is a mailbox budget, not a server setting
People keep asking us to raise their daily limit. The honest answer is that the limit they are asking about does not exist.
Nothing matches that search.
Try a different word, or clear the field.
// next step
Your product can sell itself.
Paste the install prompt into Claude Code or Codex. It sets up the CLI, signs you in, and stops for your approval before anything sends.