
Warmbox automates email warm-up by sending emails that are opened, bookmarked, replied to, and marked as favorites through a network of 35,000+ private inboxes from 100+ countries. The platform works with Gmail, Outlook, SMTP, and others with detailed analytics on email performance.
AI-powered email warm-up platform for improving deliverability
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Secure cloud productivity platform
Founded
G2 Rating
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Microsoft 365 (formerly Office 365) is a comprehensive cloud-based suite of productivity tools including Outlook for business email sending with enterprise-grade reliability.
Starting Price
Mailmeteor is a cold email tool working directly with Gmail for personalized campaign management and engagement tracking.
Cold email inbox provider with 87% inbox placement and 4.1% reply rate
Starting Price
Puzzle Inbox is a cold email infrastructure provider offering pre-warmed Google Workspace and Outlook 365 inboxes for cold email outreach.