ContactMail is a browser-based toolkit for people who manage email contact lists and campaign preparations. Its current Database Check tool helps users audit and clean CSV or TXT lists, with support for files of up to 250,000 rows each. It identifies email providers, reports invalid addresses and their detected issues, and removes duplicates, junk domains, malformed addresses, and all-caps entries.

Users can preview results and export valid, unique, or invalid addresses, or organize lists by provider and into batches for warm-up. ContactMail says list analysis runs locally in the browser and that contact lists are not uploaded to its servers. An email verification step is required to unlock exports and create a cabinet account; the site says it does not store the contact list.

The service also outlines planned campaign-planning and template features. These are described as forthcoming, including a shared calendar for sends and deadlines, reminders, collaboration tools, and a library for organizing and previewing text and HTML templates