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Re: [ietf-smtp] CHUNKING and PIPELINING

Viktor Dukhovni <ietf-dane@dukhovni.org> Tue, 09 March 2021 20:47 UTC

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From: Viktor Dukhovni <ietf-dane@dukhovni.org>
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Date: Tue, 09 Mar 2021 18:47:18 -0200
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Subject: Re: [ietf-smtp] CHUNKING and PIPELINING
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> On Mar 8, 2021, at 10:45 PM, Gene Hightower <gene@digilicious.com> wrote:
> 
> I can pipeline QUIT after BDAT nnnn LAST to Google's servers and it
> seems to work. Works with Microsoft/Outlook, too.

Thanks, I just tried it, and it worked for me as well.
Jeremy, was there perhaps a bug in your code?

[slightly obfuscated transcript]:

< 220 mx.google.com ESMTP m18si8702635qkn.9 - gsmtp
> EHLO amnesiac.example
< 250-mx.google.com at your service, [192.0.2.1]
< 250-SIZE 157286400
< 250-8BITMIME
< 250-STARTTLS
< 250-ENHANCEDSTATUSCODES
< 250-PIPELINING
< 250-CHUNKING
< 250 SMTPUTF8
> MAIL FROM:<nobody@example.org>
> RCPT TO:<nobody@gmail.com>
< 250 2.1.0 OK m18si8702635qkn.9 - gsmtp
< 250 2.1.5 OK m18si8702635qkn.9 - gsmtp
> BDAT 129
> BDAT 0 LAST
> QUIT
< 250 2.0.0 OK m18si8702635qkn.9 - gsmtp
< 250 2.0.0 OK m18si8702635qkn.9 - gsmtp
< 221 2.0.0 closing connection m18si8702635qkn.9 - gsmtp

A tcpdump confirms that pipelining took place:

25 > 34153: Flags [P.], length 53: SMTP: 220 mx.google.com ESMTP e16si7561792qts.371 - gsmtp
34153 > 25: Flags [P.], length 26: SMTP: EHLO amnesiac.example
25 > 34153: Flags [P.], length 168: SMTP: 250-mx.google.com at your service, [192.0.2.1]
34153 > 25: Flags [P.], length 64: SMTP: MAIL FROM:<nobody@example.org>
25 > 34153: Flags [P.], length 42: SMTP: 250 2.1.0 OK e16si7561792qts.371 - gsmtp
25 > 34153: Flags [P.], length 42: SMTP: 250 2.1.5 OK e16si7561792qts.371 - gsmtp
34153 > 25: Flags [P.], length 158: SMTP: BDAT 129
25 > 34153: Flags [P.], length 42: SMTP: 250 2.0.0 OK e16si7561792qts.371 - gsmtp
25 > 34153: Flags [P.], length 42: SMTP: 250 2.0.0 OK e16si7561792qts.371 - gsmtp
25 > 34153: Flags [P.], length 58: SMTP: 221 2.0.0 closing connection e16si7561792qts.371 - gsmtp

-- 
	Viktor.

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