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Warmbase

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(1)5.0/5

Warmbase is an email warmup and deliverability tool for anyone whose important email lands in spam — founders, recruiters, freelancers, sales teams, and agencies, not just cold-email platforms. It warms your inboxes on a network of real accounts to build sender reputation, then helps you monitor that reputation so you know the moment you start sliding back toward spam. Unlike warmup bundled inside a single sending platform, Warmbase is tool-agnostic: it works with Gmail, Outlook, Zoho, custom SMTP/IMAP, and ESP-level senders like Amazon SES and SendGrid — so you can warm and monitor any inbox, whatever you send from. Warmbase also includes free deliverability tools: an inbox placement test plus SPF, DKIM, and DMARC checkers and blacklist status, so you can see exactly where your email lands and what's hurting it. Pricing starts at $9 per inbox per month, with volume discounts for agencies managing multiple client inboxes.

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