
MailAdept is an email deliverability company. It helps businesses that depend on email for growth, revenue or operations reach the inbox consistently across marketing, transactional and cold outbound streams. The company combines free diagnostic tools with a managed service. Its SPF, DKIM, DMARC, BIMI, blacklist, HTML rendering and spam word checkers are open to everyone with no account. Its subscription adds 12+ automated checks per sending domain every day across sender reputation, authentication and inbox placement, plus a dedicated deliverability expert who fixes what the monitoring finds and reviews it with the client every week. MailAdept is part of the Mailwarm ecosystem, built by Mailwarm Inc., a Y Combinator (S20) company. Mailwarm covers automated warmup and self-serve monitoring, MailAdept covers expert-led audit, remediation and continuous deliverability management. Together they monitor more than 50 million emails per month. The team works across infrastructure, sending behaviour and reputation, with backgrounds spanning Salesforce, enterprise IT consulting and email infrastructure engineering. Clients typically reach 96% inbox placement and cut spam complaints by 72% within 90 days. MailAdept serves SaaS companies, outbound and SDR teams, lead generation and email agencies, recruiters, newsletters and high-volume senders.