Plan 9 from Bell Labs’s /n/sources/patch/applied/smtpd-helo-letter/readme

Copyright © 2009 Alcatel-Lucent.
Distributed under the Lucent Public License version 1.02.
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for untrusted clients, require at least one ASCII letter in
the helo/ehlo argument, unless it's an address-literal.
this rejects

	helo 192.168.1.1

among others.  It still accepts the legal form

	helo [192.168.1.1]

but that's not what spammers send.

I've been running with this change overnight with no problems.

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