Scott Gifford <sgifford(_at_)suspectclass(_dot_)com>:
I've written a patch (against 5.9.11) which fixes this. It puts the
server's name in square brackets when using it in the MAIL FROM
command if it looks like an IP address in dotted-quad format. It's
mostly tested, although my hosting provider recently stopped accepting
mail with an unqualified envelope sender, so the testing wasn't
perfect.
Taken. I wonder why I never saw this patch before?
Which RFC requires the square brackets?
--
<a href="http://www.tuxedo.org/~esr/";>Eric S. Raymond</a>