When starting with cold emailing using inboxes, it's advisable to follow a gradual ramp-up process to ensure the health and deliverability of your emails.

Begin by sending around 10 or 20 campaign emails per day initially. Over the course of approximately 2 weeks, gradually increase this number to around 30 emails per day.
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However, it's important to note that these exact numbers are not overly critical.

Alternatively, you could start directly with sending 20 or 30 campaign emails per day while consistently maintaining around 20 warm-up emails active. This balanced approach is beneficial for maintaining the overall health and reputation of your email accounts.