OSINT NavigatorDE Deutsch

MailTester

Operator: Edustria V.O.F., Belgium

Email verification for individual addresses and lists, with SMTP queries, risk information, CSV/XLSX export and an API.

People & Identity

Open website

Product

MailTester.com: a platform for email verification and deliverability tools, with a free individual checker, list verification and a REST API.

Availability and source date

Active

As of: 17 October 2026.

No functionality test has been performed.

Use in OSINT research

Checks known email addresses or address lists for format, mail servers and mailbox acceptance. Results include individual check signals, risk information and indications of disposable or role-based addresses.

Queries

InputResultResult type
Email addressA technical classification as deliverable, risky or undeliverable, with check signals and a score from 0 to 100.
Technical check according to provider
Document / fileVerified email lists from CSV/XLSX files, with separate result groups and downloads.
Technical check according to provider

Features

  • Checks syntax, MX records and mailbox acceptance through SMTP.
  • Flags disposable, role-based and freemail addresses, as well as catch-all domains.
  • Processes CSV/XLSX lists and removes duplicate or incorrectly formatted entries before billing.
  • Exports filtered result groups as CSV or XLSX.
  • Provides individual and list verification through a REST API.
  • Synchronises lists and results with CRM and marketing services such as HubSpot or Mailchimp.

Categories

  • People & Identity
  • Email search

Coverage

Dataset

Checks supplied addresses through DNS and SMTP. Supplementary directories cover disposable, role-based and freemail addresses, as well as spam traps.

Access

Requirements

The individual browser checker can be tried without an account. A free account provides 100 initial credits, list imports and API access. Paid use is through prepaid credits or a subscription.

Export

CSV and XLSX, separated by result group or filtered. A REST API with machine-readable result fields; results can be sent back through integrations.

Provider

Edustria V.O.F.

Country of establishment

Belgium

Interfaces

API

Available. A REST API with an API key for individual and list verification. Credit packages and free initial credits include API access; subscriptions include it only from the plan with 5,000 verifications per day.

MCP

Not documented. Not documented in the reviewed provider texts.

AI agents

Not documented. Not documented in the reviewed provider texts.

Usage note

The terms prohibit checking harvested or purchased address lists for unsolicited advertising.

Limitations

  • Catch-all domains and other uncertain delivery cases are classified as risky.
  • The smallest monthly subscription plan does not include API access.

Guides and practical reports

Sources

Report an error