MailDeck

MailDeck is a cold email infrastructure platform that combines three inbox types under one provider. Microsoft 365 Outlook tenants start at $0.30/inbox with 100 inboxes per tenant and official Microsoft IP pools. Google Workspace accounts start at $2.99/inbox with the highest deliverability of any provider. Private SMTP offers dedicated IPs at $0.50/inbox for volume sending. The platform currently manages 650K+ inboxes across 1,200+ domains for 1,500+ clients sending 6M+ emails per day. Every domain ships with automated SPF, DKIM, and DMARC configuration and full DNS verification within 48 hours.