The Premium Cold Email Infra that scales.

Get unmatched deliverability with Google/Microsoft mailboxes - from a premium pool mixed with real businesses. Easy connect with instantly.ai, smartlead.ai and more.

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Trusted by 5,000+ companies
& 500+ agencies worldwide

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Built by Cold Emailers,
for Cold Emailers

100k+
Mailboxes Setup
40k+
Domains Managed
5 mins
Avg Setup Time

Mailboxes from premium mixed pool

Your accounts sit alongside real businesses, not flagged cold email farms. Unlike competitors where 90%+ of accounts are for cold email and get banned easily; ColdSire cap the share in our pool at 15% dedicated for cold email.

True domain isolation

Each domain gets its own dedicated workspace with full admin access. No shared infrastructure means your domain's reputation stays clean and independent. Maximum deliverability, zero cross-contamination.

Simple, transparent pricing

Premium accounts at unbeatable prices

Premium Google Workspace

$6/mo

per account

Premium Microsoft 365

$6/mo

per account

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Domains

$15/year

per domain

Everything included

Mailboxes from premium pool

Mixed with real businesses for optimal reputation

Instant mailbox setup

Get your accounts ready in minutes

Optimal configuration

SPF, DKIM, DMARC and email forwarding pre-configured

Centralized inbox management

Manage everything in one place - profiles, settings, and more

Seamless integration

One-click setup with Instantly & SmartLead

Workspace isolation

Dedicated workspace for each domain

Frequently Asked Questions

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Get your premium cold email infrastructure running in minutes