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According to my MCSE docs, you're never supposed to put an underscore or a
space into an NT server's name anyway, so this person is obviously brain
dead and needs to be hit with the clue stick.
Block their mail. :) I do so myself, with no handy error message that
explains the problem... 90% of the mails that comes from ms servers with
underscores or spaces in the name are spam anyway. Oh, and I agree, send
them to a web form.
> Yes, I know it's an old chestnut, but I still have to fight
> this battle
> occasionally. This time the opposition is resisting, and I
> need chapter
> and verse, moral support, advice, and anything else that's going.
>
> I'm running Exim 4.12 on Solaris 8. A misconfigured Exchange server is
> sending me a HELO name with an underscore in it.
>
> I used to reject at HELO time (default behaviour), but after
> investigating
> this particular sender, and following advice to others that I
> have seen on
> this list, I now have in my configuration
> --
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