Mail User Agent?

[Joseph Tam]

azurit at pobox.sk and Tom Sommer asks:

> How this ID extension can be enabled in Dovecot? From which version is
> it supported?

Accordind to Dovecot CAPA's response, it is already enabled

 	* OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE STARTTLS LOGINDISABLED] Ready.

However, as a previous poster noted, Dovecot doesn't do anything with
it other than to log it.  The client can elect to ignore it or send an
ID string.  The ID extension is documented here

 	https://www.ietf.org/rfc/rfc2971.txt

I speculated it could be used as a client-side CAPA info so that an IMAP
server can modify it's behaviour knowing it's dealing with a certain
client, but that is flatly forbidden by RFC

 	(Quoting from RFC)
 	The sole purpose of the ID extension is to enable clients and
 	servers to exchange information on their implementations for
 	the purposes of statistical analysis and problem determination.

 	...

 	Implementations MUST NOT make operational changes based on the
 	data sent as part of the ID command or response.  The ID command
 	is for human consumption only, and is not to be used in improving
 	the performance of clients or servers.

Joseph Tam <jtam.home at gmail.com>