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103.237.86.52 has a high threat confidence level of 72%, originating from Vietnam, on the EZ TECHNOLOGY COMPANY LIMITED network (150895). It has been observed across 52 sessions targeting SMTP, First observed on February 24, 2026, most recently active February 27, 2026.
Automated SMTP interaction performing a minimal capability check by issuing EHLO followed by a STARTTLS upgrade request and immediately terminating the session. This pattern is commonly associated with internet-wide scanners, security research crawlers, or opportunistic bots verifying whether an SMTP service supports encrypted communication. The absence of authentication attempts or message submission indicates reconnaissance or service fingerprinting rather than active abuse.