Re: [ietf-smtp] SMTP, DSNs, and enhanced replies (was: Re: SMTP server reply extensions)
Hector Santos <hsantos@isdg.net> Thu, 09 April 2020 14:17 UTC
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Date: Thu, 09 Apr 2020 10:17:08 -0400
From: Hector Santos <hsantos@isdg.net>
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Subject: Re: [ietf-smtp] SMTP, DSNs, and enhanced replies (was: Re: SMTP server reply extensions)
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Hello John. I hope all is well during this crisis. I support a technical summary of OPTIONAL Extended Reply Codes (ERC), include some examples but definitely provide references related to ERC. While ERC is widely supported, not every SMTP system needs them and do not implement them. The key consideration is that ERC is not a SMTP technical protocol requirement for SMTP communications. It is a MAY and not a SHOULD, and most certainly, not a MUST. That said, I would support the development of a formal response "language" to help automate the system, similar to the "SMTP Service Extension for Greylisting Operations" where is has been shown to have major benefit for timely mail delivery and DSNs for systems who have implemented this protocol. [1] https://tools.ietf.org/id/draft-santos-smtpgrey-00.html#rfc.section.2.3 Related to this, I would "mention" additional SMTP extended add-on protocols that have shown and have some level of SMTP benefits. Have a good and safe day. -- HLS On 4/8/2020 1:34 PM, John C Klensin wrote: > Hi. > > This note is just for information and documentation -- no action > required or requested until we have a WG. > > Thinking about my recent response to Jeremy and Timo raised > another question about 5321bis: > > Given that the DSN extensions, the DSN model, and the Enhanced > Status Codes are widely implemented and used, should 5321bis > incorporate them or at least reference them normatively? If > the latter and maybe even if 5321bis ignores them, they are > another candidate for inclusion in the Applicability Statement. > > The working copy of 5321bis Appendix G has been modified to add > the above to the list. > > best, > john > > _______________________________________________ > ietf-smtp mailing list > ietf-smtp@ietf.org > https://www.ietf.org/mailman/listinfo/ietf-smtp > >
- [ietf-smtp] SMTP, DSNs, and enhanced replies (was… John C Klensin
- Re: [ietf-smtp] SMTP, DSNs, and enhanced replies … Hector Santos
- Re: [ietf-smtp] SMTP, DSNs, and enhanced replies … Dave Crocker
- Re: [ietf-smtp] SMTP, DSNs, and enhanced replies … Brandon Long
- Re: [ietf-smtp] SMTP, DSNs, and enhanced replies … John Levine
- Re: [ietf-smtp] SMTP, DSNs, and enhanced replies Dave Crocker
- Re: [ietf-smtp] SMTP, DSNs, and enhanced replies John R Levine
- Re: [ietf-smtp] SMTP, DSNs, and enhanced replies … Ned Freed
- Re: [ietf-smtp] SMTP, DSNs, and enhanced replies Ned Freed
- Re: [ietf-smtp] SMTP, DSNs, and enhanced replies Jeremy Harris
- Re: [ietf-smtp] DSNs Claus Assmann
- Re: [ietf-smtp] DSNs Viktor Dukhovni
- Re: [ietf-smtp] DSNs John Levine
- Re: [ietf-smtp] DSNs John C Klensin
- Re: [ietf-smtp] DSNs John Levine
- Re: [ietf-smtp] DSNs Alessandro Vesely
- Re: [ietf-smtp] DSNs Viktor Dukhovni
- Re: [ietf-smtp] DSNs Ned Freed
- Re: [ietf-smtp] DSNs Dave Crocker
- Re: [ietf-smtp] DSNs Viktor Dukhovni
- Re: [ietf-smtp] DSNs Dave Crocker
- Re: [ietf-smtp] DSNs Ned Freed
- Re: [ietf-smtp] DSNs Dave Crocker
- Re: [ietf-smtp] DSNs Jeremy Harris
- Re: [ietf-smtp] DSNs John C Klensin
- Re: [ietf-smtp] DSNs Scott Kitterman
- Re: [ietf-smtp] DSNs John C Klensin
- [ietf-smtp] Variable HELO name, was DSNs Alessandro Vesely
- Re: [ietf-smtp] DSNs Arnt Gulbrandsen
- Re: [ietf-smtp] Variable HELO name, was DSNs Ned Freed
- Re: [ietf-smtp] Variable HELO name, was DSNs John C Klensin
- Re: [ietf-smtp] DSNs John C Klensin
- Re: [ietf-smtp] DSNs Dave Crocker
- Re: [ietf-smtp] DSNs Ned Freed
- Re: [ietf-smtp] DSNs Viktor Dukhovni
- Re: [ietf-smtp] DSNs John Levine
- Re: [ietf-smtp] DSNs Sam Varshavchik
- Re: [ietf-smtp] DSNs Valdis Kl ē tnieks
- Re: [ietf-smtp] DSNs Scott Kitterman
- Re: [ietf-smtp] DSNs John Levine
- Re: [ietf-smtp] DSNs Sam Varshavchik
- Re: [ietf-smtp] DSNs Valdis Kl ē tnieks
- Re: [ietf-smtp] DSNs Laura Atkins
- Re: [ietf-smtp] DSNs Sam Varshavchik
- Re: [ietf-smtp] DSNs John Levine
- Re: [ietf-smtp] DSNs Sam Varshavchik
- Re: [ietf-smtp] DSNs John Levine
- Re: [ietf-smtp] DSNs Sam Varshavchik
- Re: [ietf-smtp] DSNs Ned Freed
- Re: [ietf-smtp] DSNs Viktor Dukhovni
- Re: [ietf-smtp] DSNs Sam Varshavchik