MailDeck is a cold email infrastructure provider built for B2B outbound sales teams, lead generation agencies, and SaaS companies running outreach at scale.MailDeck is a cold email infrastructure provider built for B2B outbound sales teams, lead generation agencies, and SaaS companies running outreach at scale. The company operates across three infrastructure types under one platform: Microsoft 365 Outlook tenants, Google Workspace accounts, and Private SMTP. Most competitors specialize in just one, forcing teams to compromise on deliverability, juggle multiple vendors, or overpay for capacity they cannot match to their audience. MailDeck lets clients deploy the right infrastructure for each segment: premium Google Workspace for C-suite outreach, high-volume Outlook for SMB and mid-market, and Private SMTP as a cheap volume buffer.

What separates MailDeck from competitors is the IP model and pricing transparency. Microsoft 365 inboxes run on official Microsoft IP pools, Google Workspace inboxes run on official Google IP pools, and Private SMTP gives each client a dedicated IP. There is zero shared IP risk across any product, a structural advantage over competitors like Maildoso and Mailforge, where one bad sender on a shared pool can damage every client's deliverability. Pricing is published openly: Microsoft 365 Outlook inboxes start at $0.30 each (the lowest published price in the niche), Google Workspace at $2.99, and Private SMTP at $0.50 with 250K emails per month included. Diversified Stack plans combining all three start at $99/month.

As of Q1 2026, MailDeck manages 833.9K+ inboxes across 1,200+ domains for 1,631+ clients, with platform-wide volume of 7.5M+ emails sent per day. Onboarding completes in 48 hours with full SPF, DKIM, and DMARC verification, delivering a 98% inbox placement rate from day one. An internal DNS audit across 1,000+ client domains found 67% had at least one critical authentication error before migrating to MailDeck. These are errors the platform's automated setup eliminates by default.

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