On Tue, 27 Sep 2005, Herb Martin wrote:
What is the thinking on "helo_allow_chars = _" --
other than "I want to receive their email" is there
a reason to accept or reject such?
It's purpose is to allow certain exceptions (like _) to the RFC allowed
helo characters.
This was you can allow _ but still disallow other prohibited characters
that are usually the hallmark of spamware.
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