Initial import of mailscanner-4.30.3.2 into the NetBSD packages collection.

MailScanner is a complete e-mail security system designed for use on
e-mail gateways. It protects against viruses, and detects attacks against
e-mail client packages (such as Outlook, Outlook Express, Eudora). It
can also detect almost all unsolicited commercial e-mail (spam) passing
through it and respond to all incidents in a wide variety of ways.

Not only can it scan for known viruses, but it can also protect against
unknown viruses hidden inside e-mail attachments by refusing entry to
attachments whose filenames match any given pattern. This can include
generic patterns that trap filenames attempting to hide the true filename
extension (e.g. ".txt.vbs").

It is superior to many commercial packages in its ability to handle
attacks against itself, such as Denial Of Service attacks caused by
messages containing the "Zip of Death". It is easy to install into an
existing e-mail gateway, requiring very little knowledge of sendmail
and no change to an existing sendmail configuration.

MailScanner itself is entirely open source, but it uses widely known
commercial virus scanning packages at its core. The other software it
uses is all high quality open source software, leading to a system that
can be trusted for performance and reliability.

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