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178.16.54.99 has a threat confidence score of 73%. This IP address from The Netherlands (AS202412, Omegatech LTD) has been observed in 19 honeypot sessions targeting SMTP protocols. Detected attack patterns include smtp open relay probe. First observed on March 25, 2026, most recently active May 6, 2026.
Automated SMTP interaction sequence consistent with open-relay validation or spam delivery testing. The client performs a full transaction flow (EHLO → RSET → MAIL FROM → RCPT TO → DATA → QUIT) and submits a minimal test message containing known probe markers such as t_Smtp.LocalIP. This pattern indicates scripted activity attempting to confirm whether the server allows unauthenticated message relaying or outbound mail submission. Such behavior is commonly observed from spam bot infrastructure validating targets before larger abuse campaigns.