Your domain's history follows you, but Gmail, Outlook and Yahoo also look at where your email is sent from. When that changes, they re-evaluate you. A sudden full-list blast from a new system looks suspicious; a gradual ramp with strong engagement confirms you're the same trusted sender.
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Spoks sends through SendGrid, the same sending infrastructure used by platforms like Klaviyo and Shopify, and we keep it warm and well maintained at all times. Every sender on Spoks also passes an automatic quality control before their first send, stricter than any we've seen elsewhere, and you've already passed it. Your warm-up builds on that foundation, it doesn't start from zero.
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We use a combination of data points from your store to sort your contacts from warmest to coldest. The first segment is your 2 500 warmest contacts, and each segment doubles from there until your full list. Each new campaign goes to the next segment. Never send the same email to more than one segment, the smaller segments are already part of the bigger ones.
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You can double your audience every send. Each send that lands well doubles your safe send size, starting from 2 500, so your full list is a handful of campaigns away. Leave at least a day between sends, and if a send comes back with high bounces or complaints, hold at that size until the numbers recover.
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Pause and hold your current segment if bounces exceed 2%, spam complaints exceed 0.1%, or open rates drop sharply. These are early warnings that you're moving too fast.