MailDeck
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MailDeck manages multiple Google Workspace and Outlook accounts for large-scale outreach, handling authentication and account setup across both platforms. The platform provides infrastructure-level management, tracking deliverability and performance across your entire mailbox pool.
Agencies and teams running hundreds of accounts need MailDeck's account and infrastructure management. It's designed for scale and gives you direct control over the mailbox layer, rather than higher-level campaign features. This approach works well if you have or want your own email infrastructure.