smtpprobe.com

If you found this name in your mail server's logs: a host of ours called probe.smtpprobe.com is a verification prober. It checks whether a mailbox exists, and it never delivers mail.

It is operated by Email Validator, an email address validation tool.

What a probe looks like

• One SMTP connection, then MAIL FROM and RCPT TO.
• QUIT before DATA — no message body is ever sent.

If you would rather not receive them

Write to abuse@smtpprobe.com and the domain will be added to the do-not-probe list.