[Dovecot] IMAP Fetch fails with BAD instead of NO

[Timo Sirainen]

On Thu, 2007-09-27 at 10:18 -0400, Reinier Bezuidenhout wrote:
> AXXX FETCH 14 (UID)
> AXXX BAD Error in IMAP command FETCH: Invalid messageset

This has been discussed in imap-protocol mailing list a few times, and
BAD is the correct reply here. For example UW-IMAP is the reference IMAP
server implementation and it gives:

x fetch 100 uid
x BAD Bogus sequence in FETCH: Sequence out of range

Looks like Cyrus replies with "NO" for some reason. I'd say it's a bug
in Cyrus instead.

Actually it's been said that FETCH should never return NO, and it was a
mistake to add that to the spec in the first place.

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