I first saw them on X. I have been running cold email for around 3 years. The last vendor I had got my mailboxes suspended. Lucky enough I saw them a day after through a X giveaway. I have both outlook and google with Puzzle Inbox. One of the best suppliers out there!
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Puzzle Inbox provides cold email infrastructure and done-for-you outreach setup for businesses that want to scale outbound reliably. Their offerings include Google Workspace and Outlook Office 365 mailboxes, including pre-warmed inbox options, plus support with the core technical setup needed to start sending (domain/DNS configuration and deliverability-focused configuration).See more
