Do you know the main threat actor types? Most attackers fall into one of four categories, each with their own favored tactics, techniques, and procedures.
|Blocking GP Policy when authentication to a remote site||23||66|
|Address space and cost in Exchange 2010 send connector||6||32|
|451 4.4.0 primary target ip address responded with 421 4.2.1 unable to connect||10||23|
|There is no valid SMTP Transport Layer Security (TLS) certificate for the FQDN||7||15|
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