Mailchk

Mailchk is an email verification and deliverability platform built for developers, marketers, and QA teams. Verify individual email addresses in real time via a simple REST API, or upload entire mailing lists for bulk cleaning to eliminate invalid, bounced, and risky addresses before they damage your sender reputation. Inbox Placement Testing shows you exactly where your emails land — inbox, spam, or promotions — before you hit send. Form Guard blocks fake and disposable addresses at the point of entry, keeping your list clean from day one.

Email Watchdog continuously monitors your sending domain for blacklistings and reputation changes, alerting you before issues escalate. End-to-end email and SMS testing gives QA teams full coverage across channels. With a free tier and paid plans from just $14/month, Mailchk replaces the patchwork of single-purpose tools most teams rely on — delivering complete deliverability confidence in one platform.