Followup to: <20030404181054.GT29167@mea-ext.zmailer.org>
By author: Matti Aarnio <matti.aarnio@zmailer.org>
In newsgroup: linux.dev.kernel
>
> With Yahoo I had at first immense problems to get any email from them,
> as their SMTP email sender uses INVALID protocol:
>
> <<- MAIL FROM: <yahoo-dev-null@yahoo-inc.com>
> ->> 501 5.1.7 strangeness between ':' and '<': <yahoo-dev-null@yahoo-inc.com>
> When you read really carefully RFC 821 / 2821 syntax about that,
> you will see that it does not allow space in that place.
> Sendmail does, and that has forced others to extend the syntax alike.
>
Sendmail, and a whole bunch of other mailers, have taken the more
liberal approach of allowing any RFC 822-compliant address in this
place (which is a *lot* more liberal than an RFC 821-compliant
reverse-path.) This is consistent with the "be liberal in what you
accept, conservative in what you send" philosophy of network
interoperability.
I suspect in Sendmail it naturally falls out of using a single set of
canonicalization rules for all syntax.
-hpa
-- <hpa@transmeta.com> at work, <hpa@zytor.com> in private! "Unix gives you enough rope to shoot yourself in the foot." Architectures needed: ia64 m68k mips64 ppc ppc64 s390 s390x sh v850 x86-64 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Mon Apr 07 2003 - 22:00:24 EST