> I understand why you want to stuff this in at the TLS layer, but
> realistically you have to change the IMAP, POP, FTP and other implementations
> to use client certs anyway, so again, why not do it right?   I don't see any
> point in designing something that isn't a complete solution to account for
> existing implementations that don't exist!   :)

You may be underestimating the amount of support for client certificates and
AUTH EXTERNAL here, in the case of IMAP at least. I believe Dovecot, Cyrus,
Courier, and Openwave all support them. Oracle's IMAP server definitely does.

On the client side, I believe both Thunderbird and Outlook support client
certificates. The state of play in the mobile space appears to be more
problematic - Apple's client reportedly doesn't support client certificates.
Dunno about Android clients.

FWIW.

                                Ned
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