Mailwarm is an automated email warmup and email deliverability platform designed to help businesses keep their emails out of spam folders and consistently reach the inbox. It improves sender reputation by generating natural email engagement between real inboxes across major providers such as Gmail, Outlook, Microsoft 365, and Yahoo. This process helps new domains, mailboxes, and SMTP servers build trust with mailbox providers before launching cold email or outreach campaigns. Email warmup is a critical step in email deliverability. Without proper warmup, new sending domains often trigger spam filters due to low reputation, sudden sending volume, or inconsistent engagement. Mailwarm automates this process by simulating authentic email behavior, including replies, marking emails as important, and removing messages from spam. The platform also provides spam score monitoring, deliverability analytics, bounce prevention, and multi-provider warmup infrastructure to help teams track and improve inbox placement over time. Mailwarm is used by startups, sales teams, marketing agencies, recruiters, and growth teams that depend on outbound email as a revenue channel. It was launched in 2020 and later joined Y Combinator and Station F. Mailwarm focuses on sustainable sender reputation growth and long-term inbox placement rather than short-term deliverability tactics.