Deliverability is the part of outbound that breaks quietly and takes a whole program down with it. ScaledMail is how we keep that risk off the client's plate. It is a managed cold email infrastructure provider that builds and runs the sending side of an outbound program: the domains, mailboxes, and authentication. You choose your volume and provider mix across Google Workspace, Microsoft Outlook, or SMTP, and their team provisions the mailboxes, configures SPF, DKIM, and DMARC, and runs warmup and deliverability monitoring on an ongoing basis. Pre-aged domains let sending start without a long ramp. In the stack ScaledMail sits underneath your sequencer rather than replacing it. It supplies the healthy inboxes that a tool like Instantly or Lemlist sends through, keeping volume spread across many domains so sender reputation holds even when outbound scales hard. At Nebor we use ScaledMail, alongside Zapmail, to buy aged sending domains and warm mailboxes for both Google Workspace and Microsoft 365. Client outbound runs on properly warmed, authenticated inboxes from day one, with no scramble to build domains under deadline. We prefer providers that specialize in cold email infrastructure because they understand the nuances of deliverability and build around that reality. It keeps the risk inside a system we own and maintain.