Sorry for top posting, my client is still broken.
I have never seen the ghost of a "system-alerts" or similar
"well-known" mail folder in the past 30 years.
Compliance with an RFC obscure feature is compellong us all to clear
subscriptions fol ders by hand.
As we meet the problem over and over again, a non-RFC configuration option could
solve the problem, and it would be very much appreciated...
On Wed, May 23, 2018 at 11:57, Aki Tuomi <aki.tuomi at dovecot.fi> wrote:
> On 23.05.2018 12:31, Rupert Gallagher wrote:
>> Dovecot does not clear the subscription file from non-existent folders.
>
> Hi!
>
> Thank you for your bug report. Unfortunately this is not a BUG, but
mandated behavior by RFC3501, see last two paragraphs in the excerpt.
>
> Aki Tuomi
>
> 6.3.6. SUBSCRIBE Command
>
> Arguments: mailbox
>
> Responses: no specific responses for this command
>
> Result: OK - subscribe completed
> NO - subscribe failure: can't subscribe to that name
> BAD - command unknown or arguments invalid
>
> The SUBSCRIBE command adds the specified mailbox name to the
> server's set of "active" or "subscribed"
mailboxes as returned by
> the LSUB command. This command returns a tagged OK response only
> if the subscription is successful.
>
> A server MAY validate the mailbox argument to SUBSCRIBE to verify
> that it exists. However, it MUST NOT unilaterally remove an
> existing mailbox name from the subscription list even if a mailbox
> by that name no longer exists.
>
> Note: This requirement is because a server site can
> choose to routinely remove a mailbox with a well-known
> name (e.g., "system-alerts") after its contents
expire,
> with the intention of recreating it when new contents
> are appropriate.
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