Re: [Exim] Exchange, HELO and underscores

richard.halln Thu, Jun 26, 2003 at 05:49:34PM +0100, Richard.Hall said:
> 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.

Well, this is kind of a tough issue when you look into it deeper. The
older versions of the SMTP standards also state that a server must not
reject email based on HELO data. The issue is how long do you give them
to be compliant with newer standards?

I think the proposal by one of the other people on the list here is the
right one.. Give them a reasonable deadline to fix it after which you
will no longer accept mail.