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Re: [Jmap] Address Validation (was Re: Submission)

"John R Levine" <johnl@taugh.com> Mon, 24 April 2017 13:43 UTC

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Date: Mon, 24 Apr 2017 09:43:23 -0400
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From: John R Levine <johnl@taugh.com>
To: Adrien de Croy <adrien@qbik.com>
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Subject: Re: [Jmap] Address Validation (was Re: Submission)
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> when I made the suggestion, I was imagining that although you can't do VRFY 
> or EXPN or probe emails and yes this is for good reason, the number of times 
> I've had bounce messages a long time after submission for problems such as 
> NXDOMAIN, means the current system isn't very good at even this.

Once again, that's a change to SMTP and in this case a fairly large and 
incompatible one.

On all the mail systems I know, if you try to send mail at a domain that 
doesn't exist, it fails instantly.  The problem is when you send mail to a 
domain that has an A record but no mail server.  There's no way for a 
client system to tell a nonexistent mail server from one that crashed and 
will be back shortly.  Maybe the retry timeout should be less than the 4-5 
days that RFC 5321 suggests, but that's a quality of implementation issue 
that has nothing whatsoever to do with JMAP.

Regards,
John Levine, johnl@taugh.com, Taughannock Networks, Trumansburg NY
Please consider the environment before reading this e-mail. https://jl.ly

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