A new sending address has no history, so providers treat it cautiously. Warm-up starts with a small number of messages to engaged recipients and increases volume over weeks while maintaining low bounce and complaint rates.
Why it matters
Sending large volumes immediately from a new domain can trigger spam filtering. A gradual ramp builds a positive reputation that supports long-term deliverability.
Common pitfalls and tips
Warm-up is not a one-time task. After a long pause in sending, or a jump in volume, ramp up gradually again and keep watching bounce and complaint figures.
Example
A new sales domain sends 20 emails a day in week one, 40 in week two and so on, only to verified contacts, while the team monitors bounces and replies.
How Leadvaro relates: Starting with clean, verified contacts from Email Finder makes warm-up safer.