What is ColdSire?
ColdSire provides pre-configured premium mailboxes on Google Workspace and Microsoft 365. Each account ships with full authentication records ready to send. Teams can launch cold email campaigns in minutes without manual DNS work.
ColdSire supplies dedicated cold email infrastructure built around premium Google and Microsoft mailboxes. Every mailbox arrives with SPF, DKIM, and DMARC records pre-configured, removing the need for manual DNS setup. The platform enforces true domain isolation, keeping each workspace separate to protect sender reputation across accounts. Users can centralize inbox management and connect directly to outbound sending tools through a one-click integration. Domain registration is available alongside mailbox provisioning, giving teams a single vendor for the entire sending foundation. The service targets cold emailers who want reliable inbox placement without managing infrastructure themselves.
Ideal Customer Profile
Startups, agencies, and SMBs running cold email campaigns who need premium mailboxes with strong deliverability and minimal setup effort.
