Report text for password protected archive

[John Wilcock]

Just upgraded to 4.28.4, and minutes later a Bagle shows up. 

>    Subject: E-mail account disabling warning.
>     Report: Message contained password-protected archive

How about prefixing the report text with "MailScanner:", for consistency
with other virus reports - and to show that MS itself is the bees'
knees!

John.

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