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Re: [art] Auto-configuring Email Clients via WebFinger

"Paul E. Jones" <paulej@packetizer.com> Thu, 25 July 2019 04:09 UTC

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From: "Paul E. Jones" <paulej@packetizer.com>
To: Dave Cridland <dave@cridland.net>, John R Levine <johnl@taugh.com>
Cc: "General Area Review Team (gen-art@ietf.org)" <art@ietf.org>
Date: Thu, 25 Jul 2019 04:08:57 +0000
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Subject: Re: [art] Auto-configuring Email Clients via WebFinger
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Dave,

>We could bake that functionality into the autoconfig fomat, of course, 
>but it feels like refreshing the config can happen at a different 
>cadence to a SRV lookup, and besides, SRV works well.

It works well for the simplest use case, but SRV records are really 
limited. I can name a three things SRV records cannot do today that are 
effectively render it useless for me:

1) It cannot tell the MUA the login ID to use (which may or may not be 
the email address) [or what credential mechanism to use]

2) It cannot specify (if I recall) that TLS must be used per corporate 
policy [this is important since both IMAP and mail submission generally 
offer STARTTLS as an option]

3) It doesn't allow specifying different servers for different users

Paul

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