Re: [ietf-smtp] Experimental (was: Re: homework, not an experiment, draf

On 05 Aug 2021 22:45:58 -0400, "John Levine" said:
> It appears that Dave Crocker  <dcrocker(_at_)bbiw(_dot_)net> said:
> > that's one less thing to make this more complicated...
> If we have a mail corpus it'd be interesting to see how many Received headers 
> have "for" clauses
> and if they match up at all with Delivered-To.
>
> Probably not, the "for" clause was never very popular.
Don't bet on that. :)

For the very old corpus, there were a total of 214,585 Received: lines, of which
65,273 had a ' for ' clause.

By comparison, out of some 31,000 emails I received during June of this year,
there are 270,893 Received: lines, of which 23,253 have a ' for ' clause.  A
quick eyeball indicates that Postfix, Exim, and Google all do it for
single-recipient deliveries (several representative examples):

Received: from mail.nanog.org (mail.nanog.org. [50.31.151.76]) by  
mx.google.com with ESMTP id i17si14861524ioi.33.2021.05.31.22.31.45 for  
<Valdis(_dot_)Kletnieks(_at_)vt(_dot_)edu>; Mon, 31 May 2021 22:31:46 -0700 
(PDT)

Received: from mail-io1-xd2a.google.com ([2607:f8b0:4864:20::d2a]) by  
shelob.surriel.com with esmtps (TLS1.2) tls  
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.94.2) (envelope-from  
<mantykuma(_at_)gmail(_dot_)com>) id 1lnx2R-0000zE-LN for  
kernelnewbies(_at_)kernelnewbies(_dot_)org; Tue, 01 Jun 2021 01:34:03 -0400

Received: from mail-lj1-x234.google.com (mail-lj1-x234.google.com  
[IPv6:2a00:1450:4864:20::234]) by lindbergh.monkeyblade.net (Postfix) with  
ESMTPS id 7AA67C061574 for <linux-kernel(_at_)vger(_dot_)kernel(_dot_)org>; 
Mon, 31 May 2021  22:47:47 -0700 (PDT)

On the other hand, there were only 2,962 Delivered-To: headers, with only 22
different values that weren't final-delivery on my laptop.

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