Warm-up is the practice of gradually increasing sending volume from a new domain or IP so mailbox providers can build a positive reputation profile before you reach full volume.
How long does email warm-up take?
Two to six weeks depending on target volume and whether the domain is brand new.
Do I need to warm up a shared IP?
The IP is already warm, but your domain is not. Domain warm-up still applies.
Why does email warm-up matter for deliverability?
Providers throttle or reject sudden volume from unknown senders. Skipping warm-up is the most common way new domains end up in spam permanently.
What is the first step to get started with email warm-up?
Start with 20 to 50 messages per day per mailbox to your most engaged, opt-in contacts.
What is the most common email warm-up mistake?
Warming with fake engagement networks that providers now detect and penalize.