On Wed, 25 Feb 1998, Alan B. Clegg wrote:
> > Already implemented in next release, which also allows underscores in
> > HELO names.
>
> But underscores are not legal in host names. Why allow them in HELO names?
Because too many M*cr*s*ft systems insist on putting them there. Quite a
few Exim users complained when I started checking the syntax of HELO in
the last release, and I had to provide a patch. It seemed easiest just
to let them through rather than invent Yet Another Option.
(This isn't the only place where Exim, in common with other MTAs, is a
bit more relaxed than a strict reading of the RFCs would permit.)
--
Philip Hazel University Computing Service,
ph10@??? New Museums Site, Cambridge CB2 3QG,
P.Hazel@??? England. Phone: +44 1223 334714
--
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