Great emails die in spam folders. Yours won’t.

Warm-up builds a positive sending history for your mailbox by exchanging realistic conversations with real mailboxes before and during your outreach. Without it, a new or newly-active mailbox sending cold email at volume is statistically likely to be filtered to spam regardless of how good the message is. If you send cold email, you need warm-up: it is that simple.

A brand-new mailbox typically needs around 14 days of ramped warm-up to build solid trust, which is why Leads Ranger increases volume gradually and automatically. Established mailboxes need less. Your mailbox health score tells you exactly when you are ready, no guessing.

Included. Warm-up is part of the Pro and Business plans at no additional cost, including the peer pool, spam rescue, health scoring and automatic ramping. We treat deliverability as the foundation of the product, not a revenue add-on.

Microsoft Outlook / Microsoft 365 connects with one-click OAuth. Any provider with SMTP access works too, including Gmail via app passwords, plus transactional providers. How many mailboxes you can connect depends on your plan: see the pricing page for current limits.

It blends warm-up performance (inbox placement, spam rescues needed, reply behavior) with configuration signals from your DNS audit into a single 0–100 score per mailbox. Green means send with confidence; a falling score warns you before providers start filtering, while there is still time to fix the cause.