Warmbase is a tool-agnostic email warmup and deliverability tool that keeps important emails out of spam. It warms inboxes on a network of real accounts to build sender reputation, then helps monitor that reputation so senders know the moment they start sliding back toward spam. Warmbase works with Gmail, Outlook, Zoho, custom SMTP/IMAP, and ESP-level senders like Amazon SES and SendGrid, and includes free deliverability tools: an inbox placement test plus SPF, DKIM, and DMARC checkers and blacklist status.