Pre-warmed inboxes. Done-for-you setup. Scale outbound. Repeat.

The Most Reliable
Infrastructure to Scale Cold Email

We provide Standard and Warmed Microsoft Office 365 and Google Workspace inboxes — pre-configured, DNS ready, and delivered in 24–72 hours. Starting at $3/inbox.

Get Started Book a Demo

Starting at $3/inbox · No minimum contracts

Rated 4.8/5 by our clients

Top Features

Trusted Teams

Used By 1,400+ Agencies & Sales Teams

Proven Results

82,500+ Active Inboxes Deployed

Fast Setup

24–72 Hour Delivery, Ready to Send

Key Benefits

Everything You Need to Scale Cold Email Without the Technical Headache

Pre-warmed inboxes, DNS setup, and deliverability optimization — all done for you.

Unlimited Inboxes From One Dashboard

Whether you're running outreach for multiple clients or scaling your own campaigns, manage all your Google Workspace and Outlook inboxes from one place.

Buy Inboxes DNS Configuration Profile Picture

Add Redirection SPF / DKIM Setup Warmup

Cold Email Campaign

Inbox 1 Inbox 2 Inbox 3 Inbox 4 Inbox 5

Answers Before You Even Ask

Not sure which inbox type fits your volume? Our team and in-dashboard assistant map your sending goals to the right mix of standard and pre-warmed inboxes.

What inbox types do you offer?

Scale Inbox AI

Thanks for asking. Our services include:

Pre-warmed Google Workspace inboxes
Standard & warmed Outlook 365 inboxes
Domains with full DNS configuration

Ask anything…

Smart Inbox Management Dashboard

With our unified dashboard you can manage every inbox, monitor deliverability, and track warmup status — or let our team handle it for you, saving you time and keeping your campaigns running smoothly.

See the dashboard

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Done-For-You Inbox Setup

Skip the technical headache. We handle domain purchasing, DNS configuration, SPF/DKIM/DMARC records, and inbox warmup so you can start sending cold emails in 24–72 hours.

Start your order

Inbox type

Pre-warmed Google Workspace

Quantity

120 inboxes · 40 domains

Delivery

24–72 hours

Place order

How It Works

From Signup to Sending in Just 3 Steps

Scale Inbox gets your cold email infrastructure ready in hours, not weeks.

Google WS Outlook 365

Order Inboxes

1Order

Order Your Inboxes

Unlimited Google Workspace and Outlook inboxes. Pick your volume, pick your domains — we handle the full setup.

yourdomain.com

SPFDKIMDMARC

MXRedirectOAuth

2Setup

We Handle the Full Setup

Domains, DNS records, SPF, DKIM, DMARC, and OAuth configuration — all done for you with deliverability best practices built in.

Connected100%

Warmup84%

Sending68%

3Send

Start Sending Emails

Connect your inboxes to your cold email tool with app password or OAuth, and start sending. Scale by adding more inboxes, not more volume per inbox.

Pricing

Simple, transparent pricing

Get your inboxes for cold email campaigns — no setup fees, no lock-in contracts.

Standard

$3.50/inbox

Official Google Workspace inboxes

Inboxes3 per domain
Emails/inbox12/day
Delivery24–72h
Pre-warmed—
SPF · DKIM · DMARC✓
Support✓

Get Inboxes

What Our Users Are Saying

Founders, agencies, and outbound teams trust Scale Inbox to scale cold email reliably.

Verified Reviews

I have a B2B SaaS I just started and decided to run cold email for it. Got 150 users off my setup. I'm already buying more of their pre-warmed inboxes.

— Camila R. · 5 stars

82,500+

active inboxes deployed across 1,400+ clients.

4.8/5

average rating from verified client reviews.

Read All Reviews

They helped me on basically everything including opening inboxes, setting up DNS settings and adding them to my sending tool.

Scale Inbox has been a game-changer for my outreach. The warmed inboxes deliver flawlessly and support is quick.

Best inbox company out there. Support is extremely fast and the deliverability is perfect — saying this as someone who dealt with SMTP inboxes for years.

FAQ

Questions, answered

Everything about onboarding, domains, warmup, and sending limits.

What is the difference between standard and pre-warmed inboxes?

Standard inboxes are brand-new and delivered fully configured — you run the warmup yourself in your sending tool. Pre-warmed inboxes have already completed a structured warmup cycle on our side, so they arrive with sending reputation established and are ready for live campaigns much sooner.

How fast will my inboxes be delivered?

Most orders are delivered within 24–72 hours. Office 365 orders are typically ready within 24–48 hours. You receive a credentials sheet plus a DNS confirmation report for every domain in your order.

Do you configure SPF, DKIM and DMARC?

Yes. Every inbox ships with SPF, DKIM and DMARC records configured, MX pointed correctly, and domain redirection in place. If you bring your own domains, we configure them for you at no extra cost.

Which cold email tools do your inboxes work with?

All of them. Our inboxes connect to Instantly, Smartlead, Lemlist, Apollo, Reply, Woodpecker and any tool that supports OAuth, app passwords or standard SMTP/IMAP connections.

How many emails can I send per inbox per day?

We recommend 12 emails per day for Google Workspace inboxes and up to 20 per day for Office 365. Scaling volume is done by adding more inboxes, not by pushing more emails through a single inbox — that is what protects your reputation long term.

Can you buy domains for me?

Yes. With our Done-For-You plans we source and purchase domains on your behalf from 500+ available options, keeping them thematically close to your primary brand domain, and configure everything before handover.

Get In Touch

Need Help or Have Questions?

Reach out anytime — our team is here to support your growth.

U.S. Support+1 (505) 523-2429 Email ussupport@scaleinbox.com

The Most ReliableInfrastructure to Scale Cold Email