Re: [exim] syntactically invalid argument(s) - rejected HELO

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Autor: Adrian Phillips
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A: Exim users list
Assumpte: Re: [exim] syntactically invalid argument(s) - rejected HELO
>>>>> "Marc" == Marc Perkel <marc@???> writes:

    Marc> In this case the server was auction.co.kr which is probably
    Marc> not a trivial server. I think that exim rejecting an
    Marc> underscore in the HELO is a bug and something that shouldn't
    Marc> happen by default even if it is technically not supposed to
    Marc> be there.


Wrong, no bug here - read RFC2821 4.1.2 :--

appear in domain name labels for SMTP clients or servers. In
particular, the underscore character is not permitted. SMTP servers
that receive a command in which invalid character codes have been
employed, and for which there are no other reasons for rejection,
MUST reject that command with a 501 response.
^^^^

Sincerely,

Adrian Phillips

--
Who really wrote the works of William Shakespeare ?
http://www.pbs.org/wgbh/pages/frontline/shakespeare/