InboxKit
InboxKit is the leading cold email infrastructure platform that automates domain and mailbox provisioning at scale. We help cold email agencies, sales teams, and outbound consultancies set up Google Workspace and Microsoft 365 mailboxes in minutes, not hours. Key features include automated DNS configuration, one-click export to 15+ sequencers (Instantly, SmartLead, Lemlist, Reply.io, etc.), real-time deliverability monitoring, and bulk mailbox management. As an official Google Cloud Partner and Microsoft Partner, we provide enterprise-grade infrastructure without the manual setup overhead.
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ColdSire
ColdSire is a cold email infrastructure platform that simplifies the setup and management of domains and email accounts for outreach campaigns. It offers at-cost pricing for over 150 domain TLDs and email providers like Google Workspace and Microsoft 365. It automates the configuration of essential email authentication protocols, including DKIM, DMARC, and SPF, to enhance deliverability. ColdSire provides centralized inbox management and integrates seamlessly with tools like Instantly and SmartLead. Users can plan their infrastructure, costs, and ROI using the platform's cold email calculator, which factors in variables such as email list size, sequence length, campaign duration, and customer lifetime value. Advanced settings allow customization of parameters like the number of email accounts per domain, daily sending limits, and expected conversion rates.
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Email Astra
EmailAstra is a cold email solution that provides instant access to pre-warmed Google Workspace accounts, eliminating the typical 14-day warm-up period. These accounts come fully configured with MX, SPF, DKIM, and DMARC records, ensuring high deliverability and proper domain reputation management. Users can launch campaigns immediately, with scalable options suitable for individual cold emailers, startups, and agencies managing multiple clients. EmailAstra's accounts are compatible with popular tools like Instantly.io and SmartLead, and each domain supports up to three users. It includes expert support for account setup and campaign optimization, aiming to boost outreach efficiency and ROI. Clients have praised EmailAstra for its reliable service, fast setup, and exceptional support, noting significant improvements in email engagement and campaign success. All accounts are fresh, unused in previous campaigns, and primarily use .com domains for better results.
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Infraforge
Infraforge offers private cold email infrastructure with dedicated IPs, enabling users to set up domains and mailboxes in minutes. Features include proxies, SSL, domain masking, prewarmed domains, and mailboxes, all with free DNS setup. The platform supports multi-IP provisioning and provides an API for seamless integration. Infraforge is designed to help users take control of their email deliverability and scale their outreach efficiently. Create hundreds of domains and mailboxes using distributed email infrastructure with premium deliverability and free automated setup. Private email infrastructure with the ability to set private IPs, API, domain masking proxies, and more. Mailbox slots allow you to delete and create new mailboxes without any additional cost, as you are charged based on the number of slots, not the number of active mailboxes.
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