The “send as” trigger is often a function of antivirus software, but Windows
Mail enables this functionality by managing its own sensitivity to Trojans and other
malware that may initiate the creation of a message. When this effort is made and
detected, a Security pop-up from within Windows Vista will notify you of the
effort.
Dangerous attachments are typically those that have executable extensions.
By default, these attachments are blocked, in that the e-mail will be received
and displayed (assuming there is no other insecure content like ActiveX), but the
attachment will not be ...
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