[MlMt] IMAP problem UIDVALIDITY

[Alain Israel]

OK, thank you. I did not happen since last time. To put the mailboxes 
online again, does it make a difference if I press Resynchronize, or 
Always resynchronize? (Retry did not do any good).

Alain

On 23 Feb 2017, at 15:17, Benny Kjær Nielsen wrote:

> On 22 Feb 2017, at 19:04, Alain Israel wrote:
>
>> When I arrived this morning, I got the following message (below), and 
>> all my mailboxes were offline. I pressed « always resynchronize » 
>> and everything resumed, albeit quite slowly. Is this diagnostic of 
>> something specific (it is the first time it occurs in about a year)?
>
> The UIDVALIDITY value for an IMAP mailbox is what an email client uses 
> to determine if a mailbox is still the same mailbox. The name is not 
> sufficient, because another email client might have deleted a mailbox 
> and then created a new one with the same name. This could lead to an 
> incorrect mapping between local emails and server emails. Therefore, a 
> changed UIDVALIDITY value for a mailbox signals that the email client 
> should forget everything about the mailbox and re-synchronize it. It's 
> the only safe option.
>
> I cannot tell you why this happened, but if it happens on a regular 
> basis then we can debug to make sure that MailMate does not behave 
> incorrectly (I doubt it since if it did then it would likely happen 
> very often).
>
> Some IMAP servers are pretty buggy regarding the UIDVALIDITY value, 
> but there's not much MailMate can do about that.
>
>> Resynchronize - Always Resynchronize - Retry
>
> The “Always Resynchronize” button was implemented to help out with 
> such buggy servers. I won't recommend using it in general and the 
> setting is forgotten as soon as MailMate is relaunched.
>
> (One could imagine a server which deletes certain empty IMAP 
> mailboxes. This could trigger new UIDVALIDITY values on a regular 
> basis, but in this case it's not really doing any harm.)
>
> -- 
> Benny
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