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192.155.91.55 has a low threat confidence level of 34%, originating from Cedar Knolls, United States, on the Akamai Connected Cloud network (63949). It has been observed across 11 sessions targeting IMAP, SMTP, TELNET, HTTPS, First observed on February 22, 2026, most recently active March 10, 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.