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.
Trusted by 5,000+ companies
& 500+ agencies worldwide
Built by Cold Emailers,
for Cold Emailers
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
per account
Premium Microsoft 365
per account
Domains
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
More questions need to be answered?
Would love to talk about your project. Book a call with us.