MailBoxValidator

MailboxValidator checks whether an email address is real before a message is sent. It connects to the mail server to see if the mailbox exists. The aim is fewer bounces and a better sender reputation.

What MailBoxValidator offers

• Bulk list cleaning — users upload a text or CSV file and wait for results.
• Validation API — returns results at once in JSON or XML, with sample code.
• Syntax and DNS checks — confirms format and mail server records.
• Server checks — tests the connection, greylisting and spam trap use.
• Provider checks — flags free and disposable email providers.

Who it works with

Email marketers and developers use it to remove stale or invalid addresses from lists.

Key facts

• Formats: text and CSV upload; JSON and XML output
• Single checks: one address or a whole list