Messages in this thread | | | From | "H. Peter Anvin" <> | Subject | Re: VGER's filters.. | Date | 4 Apr 2003 12:36:20 -0800 |
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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/
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