On 17 Aug 2018, at 17.20, Federico Bartolucci <federico@aruba.it> wrote:

Hello,

has anyone experiened any issues with IMAP SPECIAL-USE extension with ios11?
After the update to ios11 the Ios mail client seems to not recognize anymore the imap special-use, so that system folders (Sent, Trash etc..) are not authomatically recognized and set during the configuration.

Can you please verify that your dovecot advertises in the pre-login or post-login banner that SPECIAL-USE is advertised to be supported?
iOS Mail.app does not seem to use the special use flags unless they are advertised to be supported. (Just like RFC mandates)

Sami