How many cold emails can you send maximum per inbox?

Most people say 20 to 30 emails per inbox, and I’d agree with that if you follow my copy‑writing guidelines: keep the content plain text, sprinkle in a bit of spin tax occasionally, and make sure the copy is strong. When people try to send more than that and run into issues, it’s usually because their copy is weak, which triggers spam filters or results in a high bounce rate. So the limit isn’t a hard rule; it’s more about maintaining good copy quality and avoiding spam triggers.