Re: [Dovecot] imaptest-20130617 seems to be reporting spurious header changes

On 25.9.2013, at 2.06, Mark Weaver mark-clist@npsl.co.uk wrote:

I'm trying to use this to test an IMAP server I'm developing (I picked the nightly up from the link on the wiki page at http://www.imapwiki.org/ImapTest/Installation). With one client using the mailbox dovecot-crlf (http://www.dovecot.org/tmp/dovecot-crlf) I get messages like:

Error: test@npsl.co.uk[67]: 1035253882.5041.34.camel@hurina: Header From changed 'Timo Sirainen tss@iki.fi Timo Sirainen 'Timo Sirainen tss@iki.fi' (len 26): * 1 FETCH (UID 2093 FLAGS () BODY ("text" "plain" ("charset" "us-ascii") NIL NIL "7bit" 913 0) BODY[HEADER.FIELDS (From From Delivered-To) ] "From: Timo Sirainen tss@iki.fi From: Timo Sirainen tss@iki.fi Delivered-To: dovecot@procontrol.fi

Hmm. Interesting question. The issue here is that imaptest requests the From field twice, and you return it twice. Normally clients wouldn't do that, but I think the imaptest is correct here and I think most existing server implementations handle it like imaptest expects. From RFC 3501:

HEADER.FIELDS and HEADER.FIELDS.NOT are followed by a list of field-name (as defined in [RFC-2822]) names, and return a subset of the header.

Duplicating a From field is no longer a subset of the original header.