THIS ARTICLE IS FOR: All ListKit customers
Stage: Onboarding
Owner: CS
Last updated: Aug 2026
TL;DR
Plan for approximately 4 weeks from the moment you complete your domain and inbox setup before you are sending at full volume
This is not specific to ListKit, it is a universal requirement across the entire cold email industry
The timeline is: 48 to 72 hours for DNS configuration, 1 to 2 business days for inbox creation, 2 to 3 weeks of warmup, then approximately 7 days of ramp-up
You are not just waiting, use the Dream 100 bonus to start booking meetings from day 1
ListKit handles everything in the background, no action required from you during this period
Why this matters / When you'd use this
This is one of the most important things to understand before you get started. Knowing the timeline upfront means you can plan accordingly, set the right expectations, and use the waiting period productively instead of wondering why nothing is happening.
The full timeline
48 to 72 hours - DNS configuration
After you complete your domain and inbox setup, ListKit registers your domains and configures all DNS records, SPF, DKIM, and DMARC, fully managed on your behalf. Nothing is required from you during this window.
1 to 2 business days - Inbox creation
Once DNS is configured, your Google inboxes are created and connected to your domains. You will start seeing them appear in the Inboxes tab inside Email Engine.
2 to 3 weeks - Warmup
Once your inboxes are created, warmup begins automatically. This is the longest part of the process and the one that cannot be shortened. Minimum 2 weeks, 3 weeks recommended.
Approximately 7 days - Ramp-up
Once warmup is complete, your inboxes do not immediately send at full volume. Sending starts at 1 email per inbox per day and increases by 4 emails per day until reaching the full limit of 25 emails per inbox per day, reached on day 7. This gradual ramp-up protects your sender reputation as you scale up to full capacity.
Also worth noting, campaigns do not send on weekends. Your actual monthly send volume per bundle is closer to 22,000 emails rather than 30,000, based on approximately 22 sending days per month.
Total: approximately 4 weeks from setup to full sending volume.
Why does warmup take this long?
Inbox providers like Gmail evaluate the trustworthiness of sending addresses before deciding whether to deliver emails to the inbox or route them to spam. A brand new inbox with no sending history looks suspicious when it suddenly starts sending hundreds of emails per day.
Warmup solves this by gradually building that sending history. Your inboxes automatically send and receive low-volume emails in the background over 2 to 3 weeks, establishing a legitimate sender reputation before you ramp up to full campaign volume.
Skipping warmup, or cutting it short, means your emails go straight to spam. This is not a limitation of ListKit. It is how cold email works everywhere. Every platform, every provider, every inbox requires it. The physics of cold email do not change based on which tool you use.
The minimum is 2 weeks. 3 weeks is what ListKit recommends for the strongest possible foundation before your first campaign launches.
What to do while you wait
You are not just waiting. From day 1, you have access to the Dream 100 Launch Bonus, a training and up to $100 in gift cards to help you run hyper-personalized outreach from your main business inbox while your sending inboxes warm up.
The strategy is simple: identify your 100 most ideal prospects, send them a short personalized email from your main inbox offering a $25 gift card in exchange for a 15-minute call, and start booking meetings before your cold email campaigns ever launch.
Most customers who follow through on Dream 100 have pipeline moving before they send their first cold email.
See the full guide here: What is the Dream 100 bonus and how do I use it?
Expected outcome
By the end of week 3, your domains are registered and your inboxes are warmed up. Within the following 7 days, your inboxes have ramped up to full sending capacity and your campaigns are running at full volume. If you have been running Dream 100 in the meantime, you may already have meetings booked and conversations in progress before a single cold email goes out.
Frequently asked questions
Can I speed up the warmup process?
No. Warmup cannot be shortened without risking your deliverability. 2 weeks is the absolute minimum, 3 weeks is strongly recommended.
Can I speed up the ramp-up process?
No. The ramp-up period is pre-configured automatically and exists to protect your sender reputation as volume increases. Trying to skip or accelerate it is one of the most common causes of deliverability problems.
My inboxes have been warming up for over 3 weeks, why are they not ready?
Reach out to support via Intercom chat or at [email protected] and the team will check the status of your warmup and advise on next steps.
Can I send any emails at all during warmup?
You cannot send cold email campaigns from your warming inboxes during this period. However, you can and should be running Dream 100 outreach from your main business inbox. See: What is the Dream 100 bonus and how do I use it?
Does the warmup period count from when I subscribe or from when I complete my setup?
Warmup begins after your inboxes are created, which happens after DNS configuration is complete. The clock starts from when you complete your domain and inbox setup, not from when you first subscribe.
Why is my monthly send volume lower than expected?
Campaigns do not send on weekends. Based on approximately 22 sending days per month, your actual monthly send volume per bundle is closer to 22,000 emails rather than 30,000. This is by design and applies across all tiers.