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185.169.4.46 has a high threat confidence level of 70%, originating from United Kingdom, on the UAB Host Baltic network (209605). It has been observed across 15 sessions targeting SMTP, with detected attack patterns including smtp open relay probe, First observed on February 17, 2026, most recently active March 5, 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.