[MlMt] iCloud UIDVALIDITY issue

[Benny Kjær Nielsen]

Hi,

I didn't get any replies to my first post, but I have a few more details 
to share. It happened again for the (frustrated) user and this time I 
got an important piece of the puzzle:

	C: J145 UID COPY 24505 Archive
	S: J145 NO [CORRUPTION] Mailbox has an invalid format

The above simply means that MailMate asks to copy a message to the 
“Archive” mailbox and the iCloud server replies that the 
“Archive” mailbox is [corrupted][1]. Apparently this leads to the 
server rebuilding the mailbox and assigning a new UIDVALIDITY value. 
This then (correctly) triggers MailMate to redownload the mailbox.

This is primarily a performance problem, but unfortunately it also 
appears that any custom IMAP keywords assigned to the messages in the 
mailbox are *lost*.

The main purpose of these posts is to find out if any other users have 
issues with losing tags assigned to messages in an iCloud account.

If more users are found then I hope we might also find a way to 
reproduce what looks like an iCloud server bug. That might lead to a 
possible workaround (and a bug report for Apple). Note that as long as I 
cannot reproduce the problem myself then I cannot claim with 100% 
certainty that iCloud IMAP is to blame.

Thanks in advance.

-- 
Benny

[1]: https://tools.ietf.org/html/rfc5530#section-3

On 5 Jan 2015, at 21:11, Benny Kjær Nielsen wrote:

> Hi,
>
> I have a user (off list) with the following issue with an iCloud 
> account (`imap.mail.me.com`):
>
> * Emails in the “Archive” mailbox are tagged with various values 
> (and used for smart mailboxes).
> * After some time (might be months) a change in the UIDVALIDITY value 
> of the mailbox is reported by MailMate.
> * This requires resynchronizing the mailbox (refetching all messages).
>
> If the change of UIDVALIDITY really happened then this is all fine, 
> but the tags are lost which is of course very frustrating for the 
> user.
>
> My question is simple: Has any one else experienced this problem with 
> iCloud (or any other server)? If yes, do you have any details to 
> share?
>
> Thanks in advance.
>
> -- 
> Benny
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