Plan 9 from Bell Labs’s /usr/web/sources/patch/applied/validateaddress/readme

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Distributed under the MIT License.
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email addresses like [email protected] were not being flagged
as nonexistant because they are invalid.  example of the problem

cpu% telnet net!ladd!smtp
connected to net!ladd!smtp on /net/tcp/30
220 quanstro.net ESMTP
HELO ladd.quanstro.net
250 quanstro.net you are ladd.quanstro.net
rcpt To: <[email protected]>
250 2.0.0 receiver is quanstro.net!bilbo.baggins

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